He's clearly a big talent. If I have a reservation - this may be relevant or not - it is attitude. I live here in Scotland and often read interviews or post-match comments. He often seems to talk about showing people his quality on the big stage, but talks much less about learning.
I've always felt Kelechi absolutely spot on in that respect: he's already a very good player, but he speaks all the time about improving and working hard, rather than showing people he's already a big star.
It might be a small thing, but it has struck me a few times now.