The nice thing about this roster and KK's role is although he is projected as a top 2 centre, he really doesn't need to be that for the team yet. Suzuki and Danault are pretty good bets as top 2 centres for the future. One thing you don't want to do is give up on a guy like KK because you don't like how quickly he's progressing.
Bigger centres do take a long time. One player to consider would be Mika Zibanjed. Played 9 games in his D+1 year, split time between AHL and NHL in his D+2, then progressed slowly over the next 3 seasons. Sens got impatient and traded him for Brassard, who was the more established centre at the time.
Mika Zibanejad Hockey Stats and Profile at hockeydb.com
In his 7th season in the league (not counting the 9 game trial in his D+1) he finally broke out for 74 pts, then this season he has 75 pts in 57 games and is now, in his 8th full season, a true, #1 centre.
I don't think it's going to take KK 8 seasons to get there, but the point is there should be no rush for KK. If he takes 4-5 seasons to become a true #1 or #2 centre that is OK. Please be patient!