PROFILE COMPETITOR

Ethan Crelinsten

CANADIAN NO-GI B-TEAM JIU-JITSU RENZO GRACIE ACADEMY (FORMERLY)

Canadian no-gi competitor and founding B-Team member whose game centres on leg entanglement entries chained into back attacks. Notable for consistent results at CJI, WNO, and ADCC events at the middle weight classes.

Opening

Ethan Crelinsten is a Canadian no-gi competitor whose game is built on leg entanglement entries that chain into back attacks rather than terminating at a heel-hook finish. He developed at the Renzo Gracie Academy in New York during the late Danaher Death Squad period and was a founding member of B-Team Jiu-Jitsu after the 2021 split. His distinguishing competitive feature within the broader DDS / B-Team framework is the conversion rate from leg engagement to seatbelt — the leg entanglement is treated as a back-take entry mechanism rather than as a terminal position. He competes at the lighter weight classes (–66kg / –77kg range) where the entry-to-back-take pattern produces a higher rate of finishes than heel-hook-only systems do at those weights.

Competitive record (no-gi)

  • CJI 2 (2025) — competitor at –66kg in the Craig Jones Invitational team format. The CJI format’s pit structure and engagement-incentive ruleset produced a competitive context aligned with his entry-density game.
  • WNO appearances across the 2020–2025 cycle, including title-fight performances at the lighter weight classes against established submission-only roster names.
  • Multi-time ADCC Trials competitor.
  • Polaris and Submission Underground appearances — submission-only formats in which his back-attack-through-leg-entry pattern is most directly readable.
  • Founding B-Team Jiu-Jitsu member (2021) alongside Craig Jones, Nicky Ryan, and Nick Rodriguez — part of the cohort that relocated from the Renzo Gracie Academy to Austin after the late-2021 split.

The game through invariants

Leg entanglement entry as a back-take mechanism. The architectural feature of Crelinsten’s game is that the leg entanglement is, primarily, an entry to back exposure rather than to a heel hook finish. The mechanical sequence runs from a level change into a leg entry — typically through a saddle or cross-ashi destination governed by inside space control — to a transition that converts the defender’s escape attempt into a turtle, four-point, or rear body lock exposure. The same inside-position connection that produces the leg entanglement also produces back exposure when the defender’s escape rotates them in the opposite direction; hip access applies at the leg entry, and connection precedes control governs the back-exposure transition. See cross-ashi.

The seatbelt-to-strangle progression as the primary finish. Once back exposure is established through the leg-entry chain, the finish runs through the canonical DDS seatbelt-to-rear-naked-choke progression. The mechanical principles are connection eliminates space at the seatbelt and connection precedes control through the strangle setup. The body triangle is used to consolidate when the opponent’s hip mobility is high enough that the seatbelt alone cannot close the back-exposure window. See seatbelt, body triangle, and rear naked choke.

His specific contribution to the B-Team system. Within the broader B-Team framework, Crelinsten’s game expresses the leg-entry-to-back-attack chain at middle weights, where Gordon Ryan’s heavyweight expression and Craig Jones’ Z-guard-centred system both face structural constraints — Ryan’s body lock pressure works less well at lighter weights, and Jones’ Z-guard system was developed at heavier weights where the half-guard knee shield holds longer. Crelinsten’s entry-density adaptation, drawing partly on Nicky Ryan’s lighter-weight tempo solution, is the team’s most legible middle-weight expression of the DDS framework. The mechanical principle remains inside space control; the strategic adaptation is a tempo-and-conversion answer to the constraint that lighter opponents move faster relative to the attacker.

Standing entry through level change and the front body lock. Crelinsten’s standing entries operate through wrestling-derived level change — level change before penetration — into either a front body lock, a single-leg attempt, or a snap-down to front headlock. The standing exchange is treated as a feeder into the leg-entry-to-back-attack chain rather than as a separate attack tree. The front headlock and guillotine system is a parallel finishing path when the opponent’s defensive response surrenders the head before the back exposure consolidates.

Defensive game from inside the opponent’s leg entanglement. Crelinsten’s defensive posture from inside an opponent’s cross-ashi is consistent with the broader B-Team training approach: hand-fighting to deny heel grip, hip rotation to reduce knee exposure, and aggressive boot-out timing before the entanglement consolidates. The defensive principle is the inverse of the offensive one — denying the inside space the attacker requires (the inverse of inside space control) — and the practice partner pool at B-Team produces a high-frequency exposure to elite-level leg attacks that informs the defensive standard.

Contribution to the sport

  • One of the founding competitive figures of B-Team Jiu-Jitsu (2021). The team’s continued elite competitive output across CJI, WNO, and ADCC events is the institutional outcome the late-2021 split made possible, and Crelinsten’s middle-weight contribution is part of the team’s competitive density in that weight range.
  • Demonstrated, through CJI and WNO competitive output, that the leg-entry-to-back-attack chain is reproducible at middle weights with appropriate tempo adaptation. The entry-density approach he applies is the most legible middle-weight expression of the broader DDS framework alongside Nicky Ryan’s lighter-weight version.
  • Competitive expression of the B-Team training-room development that has continued since the 2021 split — the team’s instructional output and competitive results draw partly on the developmental pattern his progression illustrates.

Techniques. Cross-ashi · Inside heel hook · Seatbelt · Body triangle · Rear naked choke · Front body lock

Invariants. — Inside space control determines the entanglement · — Hip access is the functional goal of all single-leg attacks · level change before penetration — Level change is the prerequisite for penetration · — Connection eliminates space and transfers weight · connection precedes control — Connection is the prerequisite for all control

Concepts. Leg lock system · Rear naked choke / back attack system

Other profiles. Craig Jones · Nicky Ryan · Garry Tonon · John Danaher · Gordon Ryan · Eddie Cummings

Competitive context. State of competitive no-gi 2026 · History of no-gi submission grappling · Leg entanglement meta · Back attack meta

References

  • CJI official records — Craig Jones Invitational 2024 and 2025 bracket reconstruction.
  • FloGrappling event coverage of WNO appearances across the 2020–2025 cycle.
  • ADCC trials and qualifying-event official records.
  • Public statements from Craig Jones, John Danaher, and the broader B-Team / former DDS leadership on the developmental period at Renzo Gracie New York and the 2021 relocation to Austin.
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