I think one thing that helped Josh take the next step as leader of the team was not having Diggs there. Diggs has an alpha persona and will try to step up as the leader. That said, I wonder if his departure also forced Josh to be the one to step into that role, and if Diggs would consider coming back and letting Josh continue as the new unquestioned leader of the team. The leadership dynamics have changed, but would Diggs actually fall in line behind Josh now, because everyone knows Josh can actually fill that role now?
Also, given Diggs’ circumstances, I wonder if Beane gave him an idea of his market value to the Bills (aka, hey, we’d be willing to pay you this), and Diggs is using that as leverage to land himself some kind of deal elsewhere. Which would be fine by Beane if we weren’t serious in going after him, because it at least drives up the price a little for someone else.