Yea he definitely does but ultimately if Seattle really wanted him, and he seems like the type of player they might pick, I wouldn't think the Leafs should pushback too much because ultimately they have to give up something. I also feel Sandin has a bright future on this team and he'll be knocking on the door for Dermott's spot, probably quarterbacking PP2 like Lehtonen would if he were in the lineup. Dermott could become the 3rd pair RD but I think the defensive makeup Dubas has constructed this season is optimal, with a heavier D in Bogo in that place that can fill a PK void. A lot can change in a year though with an injury, a sudden emergence of a player, maybe Sandin doesn't progress enough, or Rielly's contract status... so he's definitely worth holding on to as long as they reasonably can. If between him, Sandin, & Liljegren can manage pk without a bogo type of player maybe they roll with that. Maybe Sandin could be splitting games with Dermott and/or Bogosian like a lot of us thought Lehtonen would be this year too.
My personal guess is that the young guys on the cusp progress and create some good problems that management will have to make decisions on, when the time comes.