Look at his vids, he wasn’t attacking the board as Powell did. His take off leg was even sometimes bent, that way is more difficult to mantain stiffness. Only towards his last years he managed to get full use of his power. His posture was superb.
But at his speed I understand that it has to be pretty difficult to coordinate efficient take off.
He had sick consistency though, and that’s probably the result of having a more controlled take off. It’s like the reverse vs. non reverse dilemma in the discus throw.