They want Rampage to keep winning. That's the only reasoning I can see behind giving him Hamill to him instead of Davis. As far as the Light Heavyweight division is concerned, Phil Davis is labeled the next big thing after Jones and Bader, so they probably don't want to take the chance at him managing an upset over Rampage. I still think they are moving toward a rematch between Rampage and Shogun if he beats Jones, and if you look at Rampage vs. Hamill on paper, Rampage should dominate him.
BUT, this fight could go either way in my opinion, just like most of Rampage's fights. Mainly because we don't know which Rampage will show up. If Rampage is upset that he has to fight Hamill instead of Rashad, that could lead to a negative training camp for him on a mental level, and Rampage's mental level always affects his physical. When Rampage doesn't show up with his head in the game 100%, his chances of losing are 50/50.
With that being said, Hamill can also mess up any chance of a win. As we've all seen in the past, Hamill sometimes throws away all his wrestling capabilities and prefers to stand and use his medicore boxing. If he does this with Rampage, there is no doubt in my mind that he will go to sleep. If Hamill wants to win, he needs to concentrate on his wrestling offense. Put Rampage on his back, ground and pound him, if he gets up, rinse and repeat. If he's serious about winning, he should only use his boxing to set up takedowns.
I think this has the potiential to be a very exciting fight. I just don't like the way it ends for The Hammer.