Here's the thing as I see it. Andy owns the pictures, he took them, they are his. However, the Buffalo Bills image and the NFL image are owned by each respective entity and cannot be reproduced without express written consent and in most cases this will apply to the player's likeness and name as well. If Andy wanted to sell the pictures, he would have to have consent of the Bills and NFL to do so, or we could photoshop the pictures and remove the Bills and NFL logos from them and only need the player's consent through the NFLPA.
With that, he should be fine to copyright the pictures as they are technically his and no one else can claim his work, but he still cannot sell them until he is licensed by the NFL or other bodies involved.