I think he'd have a good grip on the Replica Program, since Xion was a product of it, not the originator of it. Vague familiarity might work, since he never saw her as 'Xion' visually at all, if I recall correctly. A little girl in his Organization that he doesn't clearly remember will keep him a little offbalance. It is a nice jacket isn't it. Can't say the Organization doesn't have good style.