I wouldn't be that afraid for Fedor to be honest.
Jones is not a power puncher.
Now that he's not young anymore, can't take steroids like before, he's basically a tall man slowly walking forward in his recent fights.
He gets lit up easy, his hands are not on that level and never will be. His defence is nothing to write home about, he gets tagged.
I know Fedor would probably lose right now, but I don't think he'll get KO'd or anything. He'll just gas after the first rounds and lose via a sub or strikes.
BUT, he'll win the first 2-3 minutes 100%.
Remember, Jones just got beat(unofficially) twice by virtual nobodies. Who was Thiago Santos before the Jones fight? A journeyman. These people are now famous cause of their Jones fights. Santos is not some up and coming prodigy. He's old. Reyes is a web designer.... these are not some famed martial artists we were eagerly waiting to see vs Jones.
My point is, Jones is much much weaker now than you all think. No youth, no roids. He would get slaughtered by a Stipe or an Ngannou.