Jack Charlton was never a Manure player BTWwhilst it is great that we have supplied so many players, teams like United, I would imagine, have supplied far more essential players (Robson, both Charlton's, Beckham, Scholes, Ferdinand, G.Neville, Rooney, Stiles spring to mind immediately)
Another good barometer might be how many caps those players received (Caulker, Gardener and Livermore are all one cap wonders).
Not to belittle the achievement by any stretch - it should be a source of pride.