I try to think as GM

Interesting way of tiering prospects. Personally, I’d move Nelson up a tier but outside of that I won’t nitpick. Would like to see your thoughts in a mock draft.

I really don't get the hype on Mintyukov, to me, he's pretty much Lane Hutson but taller

Not arguing ranking but do to team need buffalo wont be taking another LHD let alone 2 with their first two picks

As posted in your thread:
1. ARI... Wright
2. MTL... Nemec
3. SEA... Jiricek
4. OTT... Cooley
5. PHI... Slafkovsky
6. NJD... Kemell
7. CBJ... Savoie
8. BUF... Gauthier
9. DET... Nazar
10. ANA... Howard

Your mock is very realistic.
I understand Nelson hype. But I am very cautious of players coming from a strong teams. He is just 5th scorer on a team, so he is not the one carrying the offense. Points-wise he is also far away from team's leading scorer. For comparison, Mintyukov and Kyrou are 2nd and 3rd scorers on their respective OHL teams. If D-man is small, his offense is very important.

I also am not as high on Duda. He is coming from a loaded team and is not standing out. Btw, you can watch MHL games live on Youtube ( https://www.youtube.com/channel/UCSmNdjK3bcYsK2cWsEig0uw ) - I do. There is nothing in his game to tell me he should be selected in front of NA players. His forward teammate Dolzhenkov is better - but I try to avoid players with small number GP under their belts. He has roughly 90 GP through past 3 seasons. It is very high-risk player.
Also players from Moskva and St. Petersburg are often overhyped. Cities from Western Russia are not far away from Scandinavia and scouts go there, while the majority of Russia remains mostly uncovered. It is part of human nature, we become biased towards a players we watch frequently. I try to think differently. When watching games I say to myself: "This guy sucks, let he proves me otherwise". It helps to remain neutral.

Simmilar thing with Djurgardens squad (Lekkerimaki, Ohgren, Ostlund, Odelius, Engstrom). What are the odds all of them are excellent players? In my opinion Ostlund is "odd man". He is not carrying a team points-wise, he is small and he doesn't score a lot of goals.
For some reason Engstrom is not well-known. He scores at simmilar rate as Odelius, has way better +/-, is taller and is on fire in playoffs (3GP, 2G, 3A; Odelius 3GP, 0G, 1A). But to be fair, I don't watch their games, so I can't rate his skating. I am just one-man-band But the numbers also matter.

He is not exceptional, just somewhat safe LD selection. Best case scenario is Sergachev II, but it is better to have realistic than optimistic expectations.
Size is very important on back end. Look at the past several Stanley Cup winners and finalists. Average of 6ft2-6ft3 and over 210 lbs is standard. Again, we are speaking about averages. You need bigger players, because smaller are not hard to find. It is unpopular opinion, but in hockey height and weight matters.

Why Kasper so low? imo he should be in top 20

I agree, BUF has a ton of LDs. If there is a chance, they should jump on Nemec or Jiricek. - as should SEA, NJD and CBJ (and maybe MTL). If not, you can choose another RD or two with lower picks.

He is probable 1st round pick. The offense is there, but his play away from the puck is suspicious. If I am GM, I want to minimize downside risk and pick safely.

Savoie and lambert to the sabres please.

Sure, Lambert might fall. Savoie should be available with your 1st pick, Lambert might still be there with VGK's pick. And RD with FLO's pick... Your suffer might end soon - the team is already on the rise.

Yeah, I've seen a lot of mocks like yours where they fall for buffalo to take them both, I hope they do is all