Yeah I don't really know there's too much headroom in terms of counting stats this year. That isn't me saying he'll have a sophomore slump or anything, but points are largely a function of role/ice time and there's only so much to go around and last year he was already about as good as you could ever expect in terms of scoring at 3C.
Danault and Domi will stay in the top 6 so unless Kotkaniemi can be part of a resurgent 1st wave PP and score lots on the power play there's just not going to be a ton more opportunity to put up points so 40 is probably the high water mark unless he forces his way into the top 6.