He's only 28, comes with a fairly small cap hit at 4.7mill for this year and next. I would seriously consider Kapanen+1st+??? Leivo? if that gets it done with NYR.
If they want Nylander/Marner, thats a hard pass. I love Kapanen, but this feels like the right player for this team to me as an outsider.
As a Leafs fan I do that in a heartbeat. Kapanen would be ok to part with.
If Marner was going to get traded I would consider it for a Karlsson though.