Rok did drop a POW 16 attack from the Carnivean, and with it the second Open Fist. He traded Spiny Growth for Primal, making him a very different kind of beast. He's very solid, but he's not a beast that protects others as our Carnivean is. He's much more of a short range beat stick. That's very cool but balances him out to being Solid and maybe slightly better than the Carnivean, but not Incredibly Better. The +1 MAT/RAT is very nice though, this is a truism.
On a weird note I always forget the Carnivean's base MAT/RAT are so low because I normally have it under Rapport!