I'm no McD apologist but this still doesn't make sense. If McD is the control freak Dunne makes him out to be there is no way he was allowing Dorsey to handle all of the "tactical details" regarding the offense. McD has openly said he wants Josh to play loose and have fun; I don't think for one moment he was trying to stifle him. If you listen to what McD said about the offense it is that it needs to be complementary and everything can't rest on Josh's shoulders.
I am on the record that I don't think McD can get them over the hump and that he chokes in the big moments, but I also think people are going waaaay overboard with their theories of what goes on behind closed doors.