He was pretty decent in a more defensive role last season, but he for sure has some things that will need polishing if he's going to hit that level.
Yeah, he could still develop into a 1C without becoming an elite offensive player. If he's a 30-40g 60-80p all situations center, that's still probably considered a 1C, just not likely an elite 1C.
No, but I think his offensive profile is probably a bit higher. There are plenty of other examples of forwards being picked in the top of the draft without necessarily having elite offensive upsides, guys like Hayton, Ladd, Kotkaniemi, Zacha (6th in a deep draft.