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Possibly the most if you had to pick one, although really it's a tossup between bjj, wrastlin, boxing and muay thai. Obviously it's best to have balance though you're right.
Fuuuuck that's a helluva KO!!
This guy is the one to watch if you like head kicks, future champion for sure.
He completely dominates former champ Johny Hendricks:http://mmaversus.com/2016/02/07/johny-hendricks-vs-stephen-thompson-fight-video-ufc-fn-82/
i think it's important, but not the most, a balance of all ftw imho,my pal here won with a head kick
https://www.youtube.com/watch?v=Ekc_BglssvA