Not only does he lack experience in the system, but it doesn't cater to him either. He doesn't have much of an arm and is immobile. He would do nothing but throw 5 yard slants and dump offs. To be fair, Kurt Warner was almost completely immobile and ran the Martz offense to perfection. And obviously, Martz doesn't mind immobility as he hand-picked Nathan Enderle to draft, and he can't run a lick. Right, but Warner could throw. Orton can't throw, and he's immobile. It's not that Martz demands mobility, but surviving with this line requires mobility, and thriving under Martz requires an arm.