There is no proof that Football won't work for the kid. He just made a position switch. We know the kid is super athletic. There are a ton of guys who are 5-6 round picks or even UDFA that make it in the NFL. It's completely reasonable to believe that with the right coaching and system he could make it to the NFL.
I've never seen the guy play either sport so I don't know where is talents are. But he has every right to push the football thing as far as he can take it, especially if that's where his heart is. AA knew the risk in drafting him. He dropped big time for a reason. And then AA knew the even bigger risk in signing him and still letting him play football.