I honestly reject the notion that Fedor's "decline" has mostly due to his age and physical decline which is obviously a factor for everyone in life. But, it's not to my mind the MAIN factor, yes age is a part of why Fedor has declined but not the physical reason for it. It's 98% imo his motivation/hunger and focus. To prove this, look at how many other fighters in both MMA & Boxing older than Fedor and far more declined physically who DID have what Fedor has seemed to have lost (until getting battered by Fabio then decided to say "Fuck this guy, he wants to stand and bang, win or loss lets do this and disrespect and best a pro boxer on the feet, which many post-top MMA fighters have tried and been iced cold KO'd for). Hendo is older than Fedor, Cro Cop is older and his last fight was a brutal one-sided beatdown, George Foreman @45 (nowhere near a mile of his old self won the HW title against Moorer)...due to yeah, motivation and the focus and huger to win. Not just the money.
But getting a guy like Fedor who's been to the top of the MMA HW mountain and stayed there on a 9 year win streak to come out of retirement with the same hunger and motivation/focus that he had as a younger man in his 20's early 30's Nog, Cro Cop, Herring etc (PrideFC day's) is not a realistic thing to expect or even assume at almost 40yrs old, with all that behind him.
If the UFC really wants Fedor, whether for the money spectacle or the "showing he isn't shit like Dana likes to say"...then get the guy Fedor has stated he'd fight at any point which is Werdum. And make Werdum say all types of shitty things about Russia, Fedor's family, how he's just a stupid religious can crusher, and a washed pos his family and country should be ashamed of. Then...let's just say that WOULD motivate Fedor to train like crazy in Holland, possibly recruit a couple people from the States in his camp, and train Combat Sambo again with the current Russian champ. So, if you can't naturally motivate Fedor due to a hunger of a younger fighter, then the idea is to piss him off by insulting everything he loves and just lighting a fire under his ass. And all the while at the press conferences have Werdum paid by UFC to do so say these things to Fedor and his camp to his face and the cameras and disrespect him in the staredown, possibly ripping his cross off his neck and throwing it after getting in his face. Let's just say...the "hunger" would come back with a vengeance and just think...we could possibly for the first time in MMA history see the first bone chilling Fedor staredown before touching gloves. That would be damn good entertainment that fight, and I'm pretty sure one way or the other somebody is getting KO'd cold or if a submission happens, it'll be a immediate armbar snap (not a wrench until they tap bs) if I had to put money on it.