3-The databook also has information on Tobirama and Hashirama. In fact Tobirama and Hashirama are in databook 1 where tsunade was not. Point and case.
1-He's not tired in this picture where he state's he's going to use it. There's no indication of heavy breathing and is actually quite confident.
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2-He was known for mastering every jutsu in the leaf according to orochimaru meaning he had other seals. It wasn't his only choice.
He is can't you tell by the name. The fact that he even says wait a year or a few months for a page that states Hashirama has her strength (which doesn't exist mind you) shows He is incompetent and a liar like I have recently posted. Hashirama has
Zero feats of physical strength. He's just a troll with a fetish for hashirama and will say whatever even if there's no proof.