Sasuke's big hangup is he will NOT kill anyone that isn't his actual target. Orochimaru pointed it out and called Sasuke "weak" like a hundred chapters ago when he basically knocked out a whole army of ninjas and didn't kill a single one. Sasuke summed it up by saying they weren't the ones he wanted to kill.
So, you're gonna be waiting a long time if seeing Sasuke kill his peers is all you're looking forward to.>>12461733
Considering how stupid Tobi acts while around members of Akatsuki (ie: before Deidara died) it WOULD be a surprise for him to suddenly reveal himself actually be the leader of a whole nation, namely one of the Big Five like Konoha. Kisame would be surprised because he himself is a defactor from a sub-nation within the Water nation.