Don't think more than two of those will be NHLers. Pateryn and Nygren probably.
According to Brisebois, Dietz really impressed him.
Thrower and Bennett: too soon to judge.
Nygren will be an NHL'r, he is already the best offensive d-men in SHL and was able to perform at every level like a top-2 (AHL, SHL).
His floor is bottom-6 on a contender team.
Pateryn is a different case, he was a defensive D-men in NCAA and revealed much more offense than expected in AHL.
Of the list that was given, Pateryn just turned 24 and MB gave him a one way contract for 2015-16. Nygren also turned 24 in June.
Both could be very NHL ready in 2015.
Just to give you an idea, among
all rookies d-men last season, half of them were 22 years old and more.
Another way to look at this is to look at
best scorers among rookie d-men.
Krug is 23, Gelinas is 23, DeKeyser in 24, Gudas is 24 and Vatanen is 23.
You can also look at
TOI: DeKeyeser (24), DeHaan (23), Czuczman (23), Folin (23), Dumoulin (22), Vatanen (23).
I think TOI is more significant... Because it reflects what the coaches are thinking about those d-men.
Of course half of them were very young but they were almost all top-10 picks: Pysyk (23rd and 22 years old), Lindholm (6th), Trouba (9th), Murray (2nd) and Jones (4th).
My conclusion is that a team like the Habs (or any contender team) will not have d-men who can make it before 22 years old.
For teams like NYI, Buffalo, Nashville, WPG etc. they can pick d-men that are more NHL ready. Even Ana picked Lindholm in 6th spot.