Oh shet, I didn't think about that. That's actually pretty broken on second thought. However, he doesn't clear as you stated. MS Obito low diffs, Pain can use BT>Soul rip before Tobirama creates shadow clones given Asura can fire a laser in a horizontal manner to clear any clones/make it obvious which is the real and which is not.
MS Obito low diffs? When it's clearly been shown that FTG is the perfect counter to Kamui? Not to mention that Tobirama has full intel on Obito anyway so he knows exactly how to counter his Kamui given his intelligence. Pain tries that then Tobirama teleports to a kunai/sword/Shadow Clone or he simply has one of his Shadow Clones to kill Deva Path via Suiton: Suidanha. Or Tobirama himself uses the technique while he's being pulled by Bansho Ten'in. Asura Path isn't taking out any of his Bunshin. You're forgetting that they too can use Hiraishin and if Asura Path does manage to, Tobirama can make more. Chakra isn't an issue with him.
Doesn't matter, unless you are willing to claim Kisame's chakra is capped at a certain Suiton mass, then your point is moot. I can go as far to say he uses his water dome to near chakra depletion (he won't, but you can think that if you want) and still not need any more chakra to win the fight since the dome basically ends the fight. The edo can no longer move in the water prison, and external sources cannot do anything about it as shown when Gai failed to penetrate it. The only plausible way of escaping alone was by disturbing the flow of the prison i.e. Hyuga, which Tobirama cannot do. He has to pull tags out of himself, unless you are claiming he can do such when restrained by massive pressure, then I don't see your point. Again, the only reason I brought up the statement of prison was to buy enough time for water dome. Once water dome is up the fight is over. Anyways, I fail to see why I am debating this match-up when it's a stomp. By the time Tobirama has placed his hand on the floor and put up the hand seal, Tobirama and the edo coffin would already be separated and in the water. Kisame blitzes them or releases shark summons inside the water dome to end Tobirama.
Larger scale technique = more chakra required. Water Dome is only deadly because of its size and it can only get to that size after Kisame absorbs a large amount of chakra. Gojou Kibakufuda ends Kisame well before Water Dome gets to that massive because the process of executing Gojou Kibakufuda certainly seems quicker [
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] than Kisame fusing with Samehada and putting Water Dome up [
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], and even if Kisame manages to get the Water Dome to that size and he's fused with Samehada, he still blows up Kisame with GK as he hasn't shown the speed to outpace an explosion of that size, and if he does manage to, then Tobirama escapes the Water Dome as it moves along with Kisame [
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].
He teleports the Edo out of the Water Prison. It isn't containing the Edo or Tobirama.