Bobby brought a lot to the table that people will never appreciate because his contributions were never as in your face as everyone else. Bobby played a lot of the layered guitars that the band does in the studio and somehow Shanks isn't playing them, or at least not the same way. His knowledge of the catalog and how Jon relied on him for a lot of backing, he became sort of like on par with Richie in supporting Jon's vocals. I absolutely believe if Bobby was still in the band the sets would have varied far more on the last leg and we would have a better more dynamic performer out of Jon.

PS
I'll probably catch hell for this but I personally find Shanks Bad Name and KTF solos just a tiny bit better than Bobby's. Almost the same if I'm being honest....