John Sullivan played his last football on loan at Cambridge, from Portsmouth. He suffered from depression, or something very similar, came to realise that he hated the life of a footballer, and has now retired from the game, and is retraining for a new career.
Could have been a decent keeper...
Dean Cox was a very good player, who should have absolutely flourished under the Gus revolution, but his immature attitude meant he never got the chance. He sorted himself out and has had a pretty decent career at Orient, but he could have had years at Championship level with the Albion.