I would shift him between outright striker and CAM, depending on quality and style of opponents.
Again, I think people are seeing that he has 30 goals and being scared he can only play further up. This is a guy who was brought in as a center mid, and not a bad one. He is better defensively than brahim, in addition to the obvious upgrades in goal scoring and assisting. Leipzig players run and press by default, no matter where he plays he will be a menace in the same way rebic is.
As a striker the thought of him linking with guys like leao, Theo, rebic and whoever we might bring in is scary. Just like how with rebic up top our play is more free flowing and open, nkunku is that but more goals.
See jota and mane signed as “wingers” but excelling anywhere at Liverpool including as basic strikers. Quality shines when you’re that good. I know that’s a lot lol but he is legit that good.