I highly doubt that Brock took a legit arse kicking to further Cain's career. Seriously. Why would Dana or anyone else have their golden goose be utterly dismantled by Velasquez? Brock is/was by far the biggest draw on the UFC roster in any weight class!
I know that since the creation of sports there have been people taking dives for brown envelopes, but in the UFC? I can't see it. Dodgy descision's are part of the parcel when it comes to combat sports.
I believe the match making is rigged to get the "best" match ups but that's as far as it goes for me.