This may not be totally accurate but Eddie spotted him whilst manager of Burnley watching the reserves play Blackburn reserves. Josh had all the talent but couldn't get close to United's first team, took a step down but wasn't a regular @ Blackburn. Eddie bought him here, then took 12 - 24 months to get him to play at his best. Last 2 seasons, he's only shown his best very rarely.
He went off the boil because his dream move to a club that suits his talents fell through. He then went to Everton, a much bigger club than us and Watford, he wasn't motivated enough to be anything more than a "time wasting" sub. He's 29, not many trees going to be pulled up around Vicarage Road : )