as a skilled adult lolHe's still going to lose to Tobirama.
You simply don't put Tobirama on water in any match-up. We've already seen a very weakened version of him counter Hiruzen's katon with no difficulty, did I forget to mention that there was no nearby water source?
...but remember he's still a kid and has only revealed his sensing abilities
and it seems skiled YOUNG kids like Izuna at this time were like Chuunin/Jounin Level