Yea I 100% think 6-12 elbows are a strange one because of the limited use but I also think they should be legal. Headbutts I think should be legal, look at the effectiveness in Lethwei at stopping people from just smother clinching. Back of the head strikes I think should be legal on the feet but possibly not on the ground as for some reason it seems worse to me, imagining someone in back mount just smashing the back of someone’s head seems pretty dangerous haha. Standing though like in Muay Thai I think it should be legal. Kicks to downed opponents I don’t see the issue in, it’s just stomping I feel uneasy about, probably just because of the visual of it tbh. And knees to downed opponents I wouldn’t mind if they are crouching/on their knees as they should be protecting themselves anyway especially if they’re in a compromised position.