All of that still can't counter the fact that Tobirama is not bound by a mortal coil while Sasuke is. Tobirama can't die, can regenerate any damage dealt to him, and has an inexhaustible chakra pool. Sasuke, while extremely impressive in his own rights, doesn't have the means to counter Edo tensei. He doesn't know, and probably isn't will to use, the Shiki Fuujin, he doesn't know any binding seals, and he doesn't have the sword of totsuka last I checked.
I'm not saying it wouldn't be a hell of a fight, but even with what little we know about tobirama's skills he still has the advantage over Sasuke due to being immortal.