I think you're reading to much into that quote. We have no idea what's happened behind closed doors. If you remember Easley last year they kept trying to get a quote or some info out of Gailey and he kept telling them to talk to the player about it, regarding his heart issue and being put on IR. I think this is a similiar situation where Gailey, being somewhat old school, doesn't feel right talking to the media about a players personal issue(grieving over his half brother's death), and he usually doesn't throw a player under the bus anyway. You can see that further in the quote when he talks about how they could all play better, and tries to get the focus off Dareus.
You can see what I'm talking about a bit when the media presses Gailey about Williams and he tells them to talk to the player. He's hesitant to give out to much info and is choosing to let the player speak for themselves. But behind closed doors I'm thinking the Bills medical staff is giving him a very clear picture of what Williams wrist is and isn't doing