Lets be sensible here, not every player that moves onto another club reproduces the successes he had with his old club for many reasons, be it style of play, manager ete etc.
I think that some are forgetting that Morgan ended up as one of the kingpins of our side and when he was injured or suspended we generally underperformed.
Morgan has not turned into a bad player overnight, his abilities are still there and I'm sure they will come back again with the right team and coaching, unfortunately I don't think it will be with saints.