I think it wasn't much of a surprise that Kimbo did poorly on the ground. He's in his mid-30's and trying to learn a young man (or even kid's) game with BJJ and wrestling. Not to say that it's impossible (look at Marcus Davis) but definitely an uphill battle for him.
I also don't think it helped one bit that he was being coached/trained/bullshitted by Rampage. Kimbo really needs to spend some time with a top training team like Greg Jackson, Couture, ATT, etc. if he wants to get his ground game defense where it needs to be. I don't know who to believe about the falling out between him and Bas (and really don't care). Maybe their personalities just didn't mesh well.
I agree that Dana looked biased after Nelson won but I also think Nelson has a major ego that needs to be addressed by the UFC Heavyweights. I really didn't like how Nelson was making it unnecessarily difficult for Rashad's training team (he really knows how to put the "me" in TEAM). I think we could have seen a much different outcome in this fight if the coaches for Nelson/Kimbo were switched but...