People still try to downplay that Forrest griffin win. Silva destroyed him so badly, he virtually stripped Forrest griffin of his elite status in MMA going forward, both as a fighter and his legacy.
Forrest griffin was definitely more proven than Gane, and it's really not close. Prior to silva Forrest was coming off fights against Rashad Evans, rampage Jackson, and shogun rua, all of which are some of Jon Jones signature wins. Not that Ganes record is anything to scoff at in terms of the heavyweight division, junior dos Santos and Derrick Lewis are fantastic wins, but being out wrestled by Francis and taking some of those big shots from Tai tuivasa certainly left him with some question marks going forward in the Jones fight, where as Forrest had proven his worth as an elite MMA fighter capable of going to war with anyone at 205.