but there is no proof that gz was the one on defense either, just his story, and he has had a lot of versions of what happened which imo ruins his credibility - and if for example if gz tried to detain tm and tm defended back, and even if he ended up getting the upperhand in the scuffle, tm is still just defending himself
You're forgetting all the evidence that shows that GZ was on the bottom:
JG's testimony
Injuries (no matter how slight)
Grass stains on GZ's backside
Back of pants more wet
Back of jacket more wet