It can be said, Minato basically copied Tobirama's style... Kishi basically was tired of creating characters, so he said, "Meh... why not have 2 characters that 1. create their own jutsu and 2. use hiraishin."
C'mon Kishi... You had so much to expand on Tobirama... Kishi basically fodderized two characters in one, by making them exact copies of each other. If Kishi had just stuck with the original plan to make Tobirama a bad ass with suiton, he would be at least 20x better. If they weren't copies of each other, maybe, just maybe, together they could defeat Genma. It would be a pretty good fight.
Do you guys think Tobirama is more bad ass if he:
A. Is like he is now.
B. Was an extremely OP suiton user.