Gai.
Btw are we talking about these arrows that were effortlessly deflected by the black rods?
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Why would something like that hit someone that was praised as "fast" by pretty much everyone he fought?. Plus with Intel I assume Gai knows that Amaterasu is preceded by a change in the atmosphere (It was Nagato that said that right? can't recall now), so either he knows one amaterasu is coming or he can dodge it like the Raikage. Btw someone refresh my memory, but Naruto in ... mmm I don't know the right term here but I'm gonna say "semi Bijuu" mode dodged the full speed of the Raikage right?. Compared to that, I don't think Gai has trouble keeping that speed up.
Now that his defense is set, his offense. Welp, not too much to say about this one, except Madara Susano'o was kinda useless against a Hirudora, cannot see Sasuke's being better.