Honestly Hall didn't even look upset or anything after the fight, you can even see him smile a couple times in the background. I think he might have thrown the fight a little bit. I think he liked Kelvin, and knows that no matter what he has a future in the UFC, and Kelvin might have really needed this contract to secure his future in the UFC. He was like "sure, go ahead and lock yourself into this shitty contract that isn't going to pay much, while I get signed to a different contract that may potentially end up making me a lot more money than the TUF contract." It's pretty obvious that Dana and company were completely riding his nuts, so that situation is completely plausible in my opinion.