Are you kidding me?
Fedor can do whatever the fuck he wants at this point.
He's beaten almost every notable heavyweight on the planet. He's been chilling as an undefeated Sambo champion for the last 8 years[just lost his 1st fight recently]. He destroyed Tim Sylvia in the amount of time it takes you to rub one out. He hasn't lost an MMA fight in his entire career [except a no contest and a cut on his face]. He trains one of the strongest camps in the world with the Moscow based Red Devil Sport club, including Gegard Mousasi and Aleksander Emelianenko.
Now tell me, why the hell does Fedor at this point need to go out of his way to accommodate anyone. He's already #1.
Who does he have to appease...he has nothing to prove. He'll ravage Arlovski, have a good, but dominant match against Barnett. Brock isn't nearly ready to face Fedor, nor is anyone else in the UFC [except for Nogueira, but I don't even think he needs to fight him anymore]
The only person who'd probably wanna fight Fedor is BJ Penn...lol