I think with some instruction from Keane he could be a decent DM. Few games I saw him in he didn't really do anything wrong nor earth shatteringly special, one of those players that does the dirty work.
It's a bit like when Bouma was brought in by Dol, we all know he was a good player but looked awful under Dol's management. I believe Bouma said once Mon came in & he was actually coached in what role he wanted he improved a lot