Just a quick history lesson for the younger dudes:
Chuck was knocking dudes out left and right. Tito had the belt but was totally ducking Chuck for a loooong time. It was ridiculous. He used every excuse in the book from "I want more money" to "me and Chuck are friends and I don't want to fight friends" (Chuck responded by saying they weren't friends LOL).
Dana got fed up with Tito's antics and finally decided to find a way to get Chuck the interim belt so the division could move forward. Everyone and their mother knew Chuck was the real "champ" of the division anyway, so they just needed a patsy to throw in there to be knocked out so Chuck could finally have his belt.
There was only one problem. Chuck had cleaned out the division. There was nobody left for him to fight that audiences would consider a worthy challenger. Chuck's title fight would be a joke if they just fed him a guy that he's already beaten, or some up-and-comer that's not really proven yet.
The good LHW's outside of Chuck and Tito were all in Pride. Rampage, Wandy, Arona, Hendo, etc.
So Dana came up with a plan. Old washed up Randy Couture. Sure, he used to be good, but he was now pushing 40 and had lost 2 in a row. It was becoming clear that he was either too old or too small for the HW division. But the dude still wanted to fight and he could easily make the cut to 205, so why not? He's a former HW champ so at the very least it won't look like we just handed the belt to Chuck. It will look like we gave him a worthy challenger.
Nobody... and I mean NOBODY expected Randy to do what he did. Until he did it. And it was awesome.