The motivation was Randy wanting to compete, and the UFC needing SOMETHING to turn the lights on for HW pay per views. As it stands, Sylvia can not hold a main event card alone, compared to the LHW Champ, MW Champ possibly, WW Champ for sure...
I don't think Randy is as crazy as you guys think. His last two fights were to a beastly Chuck Liddell, which most of us concur is pretty damn hard to beat these days. Was Randy washed up because he lost to Chuck? No. He got KTFO by the best fighter he could have fought at the time. It's not like he went down Frank Mir's road.
I think you gotta give him some credit. He didn't come back to fight Eddie Sanchez or freaking Brad Imes or some shit. He came straight for the champ. That's balls. No matter what you say about it, that is BALLS.
Bas Rutten came back from retirement, lots of guys returning to the UFC (Penn, Pulver, etc) is it such a bad thing? Let Randy do his thing. It's more important for him to say he tried a new challenge than "I went out on top." We are all dying to get rid of Sylvia some way or another, let's take any shot we can get cuz with Vera gone, we're pretty sure there wasn't anyone else left. CroCop's turn is gonna be awhile because they want to make that up for the murder it will be. Maybe Randy can get Tim, he's observed the shit out of his last few fights commentating on them, he knows him inside out.