Larkin's fine, but he'll be 29 by training camp and not really getting any better. Apart from the two Covid-shortened seasons, this season likely will be his lowest point total since 63 points in 2018. At 66 pts in 78 games, he is currently T-25 among centres. Points aren't everything of course, and I admit to not being an analytics junkie, so maybe someone else could show if his points understate his total performance. Linemates matter too, and I can think of half a dozen there linemate combos off the top of my head that would likely rack up more points for him. Plus the 4Nations showed what he can do in elite circumstances. So he's a legit #1C, but probably middle of the pack or lower-middle? NHL.com ranked him #15 centre in the pre-season and that sounded about right, but don't see who above him I'd bump in his favour.
https://www.nhl.com/news/nhl-current-players-ranked-top-20-centers