I have to believe even those quick plays have at least a 1 step drop. Isn't the center's first step backward? If the QB doesn't clear the center, their feet get tangled up, even on quick passes. It may seem like an instantaneous throw because it's part of the same motion, but I've got to believe the QB's first move is to take a step back with their plant foot. I may be wrong but I would have to see it done to convince me.