And why not?
Absent something slightly unforeseen, like Kakko or Kravtsov slotting in as your future #1C, Buch has suddenly become no better than your fourth winger in the top 6. You aren’t gonna at that guy top dollar; you probably need more of a gritty, well rounded winger as your compliment there anyway (Lias Andersson?). Buch may not even be a second liner if Andersson or Chytil surpass him.
If you can move Buch, either in a package or not, for a young top 6 center with upside, you do it all day long.