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Unlike Andrew Luck, Moore does not have sensational speed. Moore is not able to escape the pocket quickly and run over somebody like Luck can. That's why Moore is a more suitable pocket passer. Not to say Luck isn't, it just suits Moore's game.
Moore has the ability to stay in the pocket while the blitz is coming and make a pass that is on target. Moore is one of the most accurate passers in college football and it's amazing that almost all of his passes are from inside the pocket.
This translates well to the NFL. To be a successful quarterback, you have to have the ability to throw well within the pocket. Though guys like Tim Tebow have broken that mold, pocket passing ability is still key.
Especially in the Indianapolis Colts offense, there are not many roll-outs or bootlegs for the quarterback. This sets up well for Moore.