On old school option, there used to just be a loose mesh and the qb would ride the mesh with the bback. the bback would have a loose grip on the ball and the qb would decide to pull or give, and if he gave , the bback would clamp down on the ball, more based on timing than feeling the qb let go. Nowadays the mesh has been sped way up, which makes it harder on the qb, and the qb uses the angle of the ball to signal to the bb if he is getting it or not by brushing the top elbow of the bb with the tip of the ball. This also allows the qb to have a tighter grip throughout the process.
Thanks. So the QB is in charge and whatever the BB reads doesn't affect whether the BB gets the ball or not.
I don't know that the quicker mesh is always good - don't we want to wait for the defensive player who is being optioned to commit sometimes?