...Pass reaction has no effect on M2M coverage, that I have witnessed....Reaction Time is about the quickness of players initiating movement to the ball carrier/receiver....In Zone defense the Higher the Reaction time, the quicker the defender responds to where the ball is thrown; inversely, the slower the defenders respond to the RB on a hand off....
I read your threshold explanation - based on speculation;...interesting but still not cold hard facts backed by EA.
PAss Coverage obviously works, on M2m Coverage...Good luck with showing solid results with zone...
I am testing with all player ratings, core and position specific ratings set at 70; thus all i am seeing is the effects of slider changes...without taking into account different player abilities.
Pass Coverage in itself is not consistent; the route run has a effect on separation too....