I wonder if Luffy or Kaido were faster at the end of their battle.
Kaido's speed blitzes are what made him so horrifying to deal with, and one of the reasons the anime has fucked up animating him.
Kaido might have a big wind up at times, but once he starts moving, he's lightning fast.
At the same time, Luffy is one of the faster characters in the verse. I guess Kuma it technically the fastest?