That's what I'm saying, Hashi's energy is probably on a whole other level than anyone else's. I think if he's able to have large scale battles with demon foxes and crazy eye wielding motherfuckers, then he should be able to withstand a little punishment.
He doesn't engage them directly. He summons wooden zords, barriers and seals. As I mentioned before the damage he took from Gaara already makes him survivng that Bijuu gang bang complete bullshit. Unless you buy Gaara being able to apply greater force than all bijuu combined. It was concentrated on small surfaces, but the difference is too large to compensate.
This was plot shield plain and simple.