There were a few balls that were seriously under thrown, yet their receivers managed to slow down/turn around and make the catch. iirc - as many under thrown as he had were he put it in the receivers hands and they did not have to break their stride. He has good wheels, but was not all that impressed with his arm.
It's not the qb, it's how the team plays as a team that is so impressive. Someone on here - Sica, Geaux, Oxbow, not sure who it was... said its not the they do anything complicated, but their execution is so gpod.