What it will take to beat Fedor
A sambo coach. As far as I know no fighter has done that, assuming that some jiujitsu and boxing will do it for them. It seems to me nobody facing him has taken sambo seriously as it's own legitimate martial art that belongs in the ring/cage and is worth learning. For that reason they have little defense for a lot of the things Fedor does. Sambo armbars aren't like bjj armbars, the striking is different etc
What do you think it will take?