Styles make fights. If he keeps getting matched up with weaker grapplers & sloppy boxers, he can roll, like a skinny frank mir. If not to the HW title, at the very least he'll be in couple of title eliminators in his career.
Also, Cain strikes me as another brock lesnar-injury prone type of fighter. The sort who needs to take 9 months off after every fight, causing a log jam in the division. And we'll eventually end up with an interim champ & all the surrounding bullshit.
And then the struves, roy nelson types who are just hanging around can sneak in for a title shot maybe.