Dach

Can’t see the Hawks wanting to move Dach and/or Del Mastro before they have even played one game professionally. Both have developed quite well, played for Canada’s world junior team and are viewed favourably by the organization.

Furthermore, as has been stated close to 4.5 million times on this site, the Hawks don’t need another goalie, especially a low level backup with legal baggage.

Zero chance the Hawks do this

Hawks decline instantly. They aren't giving up two highly regarded prospects for that package of spare parts. Only player Hawks might have an interest in is Harris, but not if he costs Dach OR DelMastro. DeSmith and Ylonen are of zero interest

The Athletic has Dach and Del Mastro ranked 8 and 12 respectively in the pipeline, so although they are good prospects, they are not the team’s top prospects.
Harris is an upgrade over any LD in the club right now and could play with Jones on the top pair given the Hawks’ lack of depth at the position.
I agree Ylonen isn’t worth as much as any of those prospects, but in the trade, Harris is the better player, while Dach and Del Mastro would be #2 and 3. Ylonen and Desmith 4 and 5.
Having Korchinski and Harris as their top 2 LD would be a great foundation for the future.

I'm just not sure Harris is the type of D man the Hawks want to build around. He's not particularly gifted as an offensive player, and he's on the smaller side (under 6') and isn't particularly physical. I said the Hawks might have interest in him. Just not at the cost of Dach and/or DelMastro. Dach is probably a bottom 6 guy as an NHL'er, but he could be really good in that role. After the season DelMastro had last year, he's looking like a steal as a 4th rounder. If his development continues at the same trajectory, he's a legit top 4 NHL D man for sure. No disrespect to the Athletic, but their ratings don't necessarily reflect how the Hawks front office views a particular prospect. The Hawks are very high on DelMastro. As stated by Snowhawk above, the Hawks aren't trading away 20 y.o. prospects they are high on who still haven't played their first games as pro's for older guys - especially two guys in Ylonen and DeSmith who have no future with the Hawks. No chance the Hawks make this deal.