Of course there's a comparison, Lennon suffered from injuries late in his career because of the amount of exercise he had in his youth, when he should have been focussing on his technique instead of his fitness. Grogan had the misfortune of suffering his injuries before he ever had a career.
I've heard of Ferguson doing the whole "you're one of us now" routine to youth players before, think it might have happened to O'Shea as well.
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