Two different things entirely. I'm comparing raw talent, by looking at how good they were at the only level that they've all played at on a level platform - for the United youth teams. I won't argue it with you anyway, because in terms of those two I wouldn't claim there's that much in it. Harder to compare to Pearson of course because he's a very different player.
Lingard's a great little footballer and my actual point is basically that you just have to play these kids,
not caution about some imaginary gulf which they'll never be good enough to bridge while not giving them the chance to prove you wrong. Which seems to be what we're doing. Hopefully when Januzaj comes back from a so-far-successful loan at Dortmund we'll continue the trend with him. Depay's lukewarm form certainly leaves an opportunity there, especially if Rooney eventually gets dropped:
Martial
Januzaj Mata Lingard