Dermott by a wide margin over Konecny, guys that get results like he has in the NHL even in bottom pairing usage usually turn into top pairing dmen, Konecny is a good player but something that we have an abundance of and that's less valuable than what Dermott is likely to become.
value comparison aside, how much of an upgrade does Konecny really provide to this lineup when everyone is healthy? Is he better than Hyman, Johnsson, Mikheyev on the left or Marner, Nylander, Kapanen on the right? Probably, but its a pretty marginal difference, plus the Leafs have prospect depth on the wings - Bracco, Korshkov look like they're close to ready
I guess it's your prerogative, but why go looking for things to anguish over?