While the proposed deal might make sense value-wise, I get the sense that the Leafs need to go "bigger game hunting" when it comes to centres.
Obviously Matthews is #1.
Tavares will be a begrudging #2, but you'd really want him to be #3, or "2A and 2B" kind of situation.
Kampf should be #4, but Holmberg & Dewar could also fit into this spot.
Minten is a guy that you'd probably want to start on the wing, or maybe in the #4C spot.
Is Matthews-Tavares-Drury-Kampf really the group you're happy with next year??
Practically speaking, that leaves 1 spot open for a centre acquisition... and I think the Leafs need to set their sights on a younger guy who could be a legitimate #2 within a year or two, rather than somebody who probably tops out as a #3.
That being said, I could also be wrong in my assessment of Drury... he's only got 114 games of NHL experience and is only 24. He hasn't exactly had a ton of ice time in Carolina. If the Leafs believe he can be a legit, 60-point #2 centre with a little bit of development, then that's probably not a terrible idea at all.
Run Matthews & Domi as a #1 line, Drury & Nylander as a 2nd line and Tavares & Robertson as a 3rd. Insert Knies, McMann, and maybe a piece of a Marner deal on the left side.