Neo, stop quoting narutowiki. It's kinda inconclusive with regards to Tobirama's complete abilities especially when you consider that the Senju brothers's complete abilities were never really disclosed hitherto - Hashirama being a prime example. Even Tobirama's S/T techniques have not been elaborated upon and we both know how much a a bitch they can be. Factor in the thought that he was user/master of S/T TECHNIQUES (plural) would make him a difficult opponent to face. Add to that, him being an Edo and you have one formidable opponent. As for him dying at the hand sof the Cloud Bounty Hunters, it could so easily be retconned for plot convenience, considering the innumerable examples we have to show for that phenomenon.