What? The UFC lightweight title (155) was first held by Jens Pulver (a wrestler/boxer) then Sean Sherk (wrestler) then Bj Penn until 2010 (BJJ prodigy)

Every single UFC tournament has been won by wrestlers, sambo fighters, and bjj fighters, with the exception for UFC 3 where Steve Jennum (Ninjitsu) was an alternate and fought in the finals, where he won by a sloppy armbar.

The upperweights are similar. Historically dominated by wrestlers and grapplers

https://en.wikipedia.org/wiki/List_of_UFC_champions#Lightwei...