Great analysis and I agree.
#2 is somewhat relative with respect to age. It's safe to say he'll probably be at his best here once he hits his physical peak of 27
As for #8 and #10 , I haven't figured out whether he's reluctant or willing to do this at the NHL level. I'm happier if he consistently tries to do it and fails because he's small rather than not try at all
For reference, the list of attributes I think a centre should have is as follows:
1. Good at faceoffs
2. Strength to check down low
3. Read Dzone assignments
4. Navigate the neutral zone with the puck
5. Feed your wingers
6. Play in open ice more than the boards
7. Must have drive to backcheck
8. Go to the net
9. Play higher in the ozone
10. Support wingers on the offensive boards
Pettersson went to the net in the SHL, and he was quite often along the boards. The effort seems to be there. He also tended to fall down a lot.
Ultimately, the question may be: Where is he more effective? He could be a centre, but he's surpassed expectations as a winger. What is there to suggest that he will be just as effective as a centre? There was one game, IIRC, where he put up 4 points at the pivot, but then they moved him back to RW shortly thereafter...
I'm curious as to what people think will prevent Pettersson from becoming a C long-term? What issues do you foresee? This is a major question mark for this franchise.