Work it out.
Collins / Maguire. Maguire leaves, Collins has one less player in a similar position to contend with.
We were never going to find anyone close to what Harry was when he left, it seems to be going okay for him at the moment, so on reflection a good move. If Clough banished Collins for "advising" him to move, that says more about Clough than it does the player. One of the key areas that we needed sorting last season, this season we're still paying for Clough's tantrum(s).
Collins is still here, Clough isn't.
Hopefully by the start of 2016/17, Collins might have too. No disrespect to the player, but it's time now that the manager strengthened the spine of the team, starting from goalkeeper. That's another thread in itself.
Edit : Clough may have some extraordinary "powers" over former players he's worked with, maybe he didn't like it when he may have been undermined by Collins? Any player coveted by a club in a higher league will have more than a colleague advising him.. So why was Collins made the scapegoat if that's what he did?