Isaac can bring. I think he may very well shock the world with how dominant he can be in the B12. He has so many tools, and just love the way he passes the ball as a big - just a whole other dimension, as Khalifa taught us. Wouldn't surprise me one bit for him to be an all-time BYU great. Hard to top Jimmer as the "all time great," but as far as bigs, it wouldn't surprise me at all for Isaac to top them all, including Childs, Davies, Mika, Young, Araujo, and even Cosic, and many of the older Bigs from the past (Roberts, Kite, etc).
And thinking of Isaac and others coming in definitely puts some optimistic salve on the wounds of the last couple days. Go Cougs!