I'd say that anyone that is still grouping Larkin as a 2C, such as yourself, should drop the charade.
He's producing better than or comparable the following 1Cs on playoff teams:
Comparable:
Sebastian Aho
Mika Zibanejad
Evgeny Kuznetsov (better if Backstrom)
Elias Lindholm
Better:
Brayden Point
Patrice Bergeron
Ryan O'Reilly
Anze Kopitar
Any C on the Golden Knights
Any C on the Wild
He's behind Mackinnon, McDavid, Duchene, Matthews, Barkov and Crosby.
This isn't to say his value is greater than or equal to everyone listed here, but he is unquestionably in the mix with the 1Cs of competitive teams. He isn't a lock top 10 center in the league, but he's closer to that than he is to being near 30 at this point.