1. Glad you agree.
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it was to buy them time to escape.
2. Look again at the link you posted.
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After being stroke with Rasenshuriken, is lightning armor wore off. (First image of the page, you can see it clearly).
3. He was defeated quickly because he underestimated Naruto, he knew Naruto was there, so he slightly dodged the attack, and then said his jutsu was faster than Naruto's ... he was wrong, he got pwnd.
4. He tought about that xD (Dodai). And Dodai don't know all the things, he didn't even knew how the scar was made. It had to be Naruto to understand it. But
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this is how he got defeated.
5. You are right, but Naruto mentioned the Frog Kata's training, and Narutopedia give us the definition of it.
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"Using Sage Mode's inherent sensing abilities combined with the fighting style of the toads, he is able to react to an enemies attack much faster allowing him to dodge attacks by a hairline.[1]"