I know everybody probably already knows this, but I'm going to put it our there anyway. The reason Ryan Tannehill cannot throw the long ball accurately is because of his throwing motion. He has a side arm type of release that make it impossible to change the trajectory of his throw. If i recall correctly that was a concern of the NFL scouts league wide. Its just like shooting a basketball you have to be able to shoot with ARC, if not your shot will be flat and your made percentage will drop. throwing a football is the same way.