Why not, its the easiest way to end the fighting cleanly and efficiently, I don't see why he wouldn't just use it. And one-shotted by that? Heck yeah. Yuo'd need Bleach levels of durability to tank that and keep on truckin'.
He did start with a *fairly* big one when Choza's squad attacked (not huge-huge, maybe a city block). The reason it was Choza and Kakashi vs Pain is they were the only two who were able to handle it!
i meant kakashi has never been one shotted and he wont allow himself to be. kakashi created a plan to beat pain after only a real short exchange of attacks and it would have worked had it not been for demon realm.
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OT: Shikamara and Kakashi would have owned. They'd be a killer combo. Pain really isn't that powerful when you know his secret and the combo of Shikamara and Kakashi would have crushed.
No, I mean, there were a half-dozen ninja right there. The fight ended up as basically 3 vs Pain because the rest weren't tough enough and were taken out (Chouji was there too but he was out of the way of the blast).