[No disagreements there, but he really has to wonder what the criteria are for who gets to be "properly taught" on this person's world. If talent is the only factor, sure, but with how rarely that's the case on Lelouch's world... well, perhaps he's wrong. He can hope.]

Olwen did indicate that newcomers here might bring their "natural" powers with them. Your assertion only holds true if these seasonal powers are stronger than whatever they had originally.

[Or stronger than their "natural" powers even with this alleged dark energy interference, which... is something he'll likely need to investigate. He'd rather not use Geass at all, that is, but if someone from his world happens to come by and recognize him, he may have no choice.]