And yet SM naruto was able to react to his attack, and hit him first, how he wanted, where he wanted. Pain has numbers, powerful jutsus (gravitational pull alone nullifies raikage's speed feat). He can fly, he can go invisible, he can use chibaku tensei. It all depends on how will he want to play his cards, but if he goes serious from get go, raikage is over.
You just proved that 3rd Raikage could fodderize Pain. If SM Naruto was able to react to his attack and hit him first then the 3rd Raikage has even better chances of doing so., Pain lack reflexes and speed, he wont be able to react. Even if Pain has a lot of moves, its meaningless if he cant hurt the raikage, almost nothing can hurt the raikage and since he has no intel he doesnt know his weak spot. Raikage could speed blitz and end Pain.