I dont think anyone has said Dubas gets credit for the Marner pick. Just that he was an acting GM when the pick was made and that he would've likely been his pick as well. In those same drafts, it's been reported that Dubas wanted Aho over Dermott, Debrincat over Korshkov for a couple examples but Hunter made the picks.
As for Dubas' drafts, I think I've already pointed out to you in the last week or so how his drafts have been better than Hunter's. Every year he's been drafting guys that are risers and doing excellent in their post draft years like Robertson, Knies, Niemela, Tverberg, Voit, Grebenkin for example. Which of Hunter's picks (outside of the 1st round) can you look back on and say went on to have excellent post draft seasons? Dermott and Grundstrom are the only 2 that have played more than 100 games. Woll is just starting to get there now and Scott was doing well before his injuries derailed his career. What did any of the other picks accomplish?
Korshkov
Greenway
Gordeev
Middleton
Desrochers
Bracco
Timashov ( I liked this pick)
Walker
Rasanen
McGregor
Kara
O'Connell
Bobylev
Chebykin
Brooks
Mattinen
Nielsen
Dzierkals
Lindgren
Korostelev
The only ones there I would say had notable post draft seasons on that list were Brooks, Nielsen and Timashov. Bracco was disappointing for the amount of skill he had. Everyone there was pretty mediocre and not many played in the WJC.
Dubas' oldest prospects from the 2018 draft has already produced 6 players that have seen NHL ice. Knies will likely get games this year and in the next 1-2 years, we could likely see Hirvonen, Niemela, Villeneuve, Tverberg and Minten seeing NHL games.
Sandin
Durzi
Kral
Holmberg
Robertson
Abruzzese
Amirov
Hirvonen
Niemela
Villeneuve
Tverberg
Knies
Voit
Minten
Moldenhauer
Grebenkin
Hildeby
These guys are all legit prospects that have been good to great since being drafted and have NHL potential. 8 of those players have played at the WJC. 2 were named best D man. We could possibly see 4 more players at the WJC next year.
Sandin (2018 - 1st round pick) 22 year old currently bottom pairing Dman (NHL - Leafs)
Durzi (2018 - 2nd round pick) 24 year old currently playing 2nd pairing Dman (NHL - Kings)
Kral (2018 - 5th round pick) 23 year old currently playing in AHL (Leafs)
Holmberg (2018 - 6th round pick) 23 year old who was been up and down (4 line player) (NHL/AHL - Leafs)
Robertson (2019 - 2nd round pick) 21 year old often injured who has played 31 games in NHL (IR - Leafs)
Abruzzese (2019 - 4th round pick) 23 year old currently playing in AHL (Leafs)
Amirov - Not Applicable - has non related sports health that no one could have foreseen.
Hirvonen (2020 - 2nd round pick) 21 year old currently playing in Liga.
Niemela (2020 - 2nd round pick) 20 year old currently playing in Liga.
Villeneuve (2020 - 4th round pick) 20 year old currently playing in AHL (Leafs)
Tverberg (2020 - 7th round pick) 21 year old currently playing in NCAA.
Knies (2021 - 2nd round pick) 20 year old currently playing in NCAA.
Voit (2021 - 5th round pick) 19 year old currently playing in CHL.
Minten (2022 - 2nd round pick) 18 year old currently playing in CHL.
Moldenhauer (2022 - 3rd round pick) 18 year old currently playing in USHL.
Grebenkin (2022 - 5th round pick) 19 year old currently playing in KHL.
Hildeby (2022 - 4th round pick) 21 year old currently playing in SHL.
Currently out of this group there are 2 NHL players (Sandin and Durzi). I think Holmberg has shown enough that he should be on the big club full time playing 4th line. Knies will likely step into a 3rd line role once NCAA season ends.
This group is no different than any other group of prospects that all prospect junkies fall in love with however you need to be realistic with the number of prospects that actually carve out an NHL career and if they are impact players (Top 6 forwards, Top 4 Dman and Starting Goalie).
Can you (using realistic expectations) project which prospects will end up becoming, this is how I see it:
Top 6 forward: Knies (has a chance)
Top 4 Dman: Sandin (has a chance), Niemla (has a chance)
Have an NHL career (does not fit in above tiers): Holmberg, Robertson, Hirvonen