I'm not too sure either. I think maybe he had too much to prove.
It's hard to say, becasue right after the glove tap he went RIGHT after Silva, then it looks like he changed his mind... then with the chokeslam, I was assuming he was hoping to KO him with that, or get right on top for GnP. I don't think he expected to be reversed so quickly.
He likes to bring it, and that was his problem that fight. I think he had too much pressure to show he can do more, and froze up a bit. Rather than just letting him KO people, everyone got him too concerned with "What about the ground? Can you hang on the ground? Why don't you fight on the ground?" Instead of just enjoying his KO Power.