Talking to a vegan coach at my gym he feels one of the best benefits of being vego or vegan is the ability to keep weight down.
As HW going from 255 to 240 offers no real advantage, but a LW going to FW gets a huge advantage.
When more genuine cutting HWs start to appear some of them might go vego, but if weight class changes aren't possible it might not be worth the effort.
Guida, Cerrone, GSP, G-Sot, Carwin, Kampmann, BJ, Paulo, Forrest, JDS, Machida, Noke and ya gotta love Hunt.
Barao to rule them all.
Never forget the freedom fry!!!