I don’t get this at all. If you are a running QB that completes passes at a 50% clip then the defense is gonna overload the box and stop the run. This puts a ton of pressure on the OL. But if you can complete passes, long or short it doesn’t matter, at a 70% clip then all of a sudden LBs drop into coverage or you play 5 DBs. It becomes easier to block fewer men. It isn’t rocket science. Then you run AND pass. The defense has to guess rather attacking the 1 thing you think you can do well which is run.