Like
@mkess101 said, his bottom game/guard is better than RDA's. His top game/takedowns aren't. And Oliveira came incredibly close to submitting him if I recall correctly.
But RDA is a legit high level grappler, but because of his recent walk down the murderer's row of the WW division, people have seem to forgotten about it.
Felder has been taken down by damn near everyone of his opponents. Against Hooker, a fight in which was primarily a striking affair, Felder was gassed at the end of 5 rounds.
I mean it was a war so I understand, but that was the first time we've seen him go 5 rounds -- if RDA employs a grappling strategy early, it's not unreasonable to think that Felder is incredibly tired going into the championship rounds, despite him "training for a triathlon".
RDA wasn't able to submit Pettis/Diaz over the course of 5 rounds, but both of them have a much higher grappling pedigree then Felder does, and they both had full camps.
Felder could come out and KO him early, but I just don't see it. Felder's career is riddled with split decisions, despite his power. Unless the weight cut takes a significant toll on RDA, he should dominate this fight, and probably submit/TKO Felder in rounds 4/5.
edit: also Felder is talking about retirement even after a win, so that's another huge red flag.