Everything involves risk, nothing is guaranteed. That being said, he's more than worth the risk, given his upside. The biggest risk with draft picks, is even knowing whether or not they can compete or excell at the pro level. He's already shown that.
Additionally, his skill set is not only the exact thing we miss on offense, but also the perfect compliment to Josh's arm.
He doesn't need to be the guy, be a 1400-1500 yd guy to make this a successful trade. Its his impact, on how teams will need to defend us.