I was impressed by Cain's strength the first time Brock bull-rushed him (Brock was smart enough to know he HAD to get that fight on the ground). BUT I think Carwin's early fade in the Lesnar fight was a fluke and a result of too much adrenaline. I just don't think Cain can stand toe to toe with Carwin. I haven't seen JDS fight yet.
I hope it's not too late for Brock to get some more strike training, or more strike defense than simply turtling up. I'd love for him to dominate the division, but I don't know if it will happen. He seems to be a extremely dedicated in training, but that may be too much to ask. Matt Hughs dominated for years w/o being much of a stand-up striker, maybe Brock needs to get some advice from him.