No team in the league is going to trade a 22 year old roster player whose comparable to Nylander for Petro. Not a single one.
Petro is going to get around what EK returned - a quantity collection of picks and prospects- if the Blues decide to move him.
Says who you. Few factors here that are different that people like you have seen and refuse to acknowledge.
1) petro isn't being pushed out of stl like karlson was from out.
2) petro will get 7-9 mil per year compared to karlson wanting 11 like doughty.
3) stl has no issues resigning him at all.
4) petro wife is from stl and they just had triplets. More likely he stays then leaves.
5) nylander is over paid and under performing you don't trade 60pt wingers for #1 rhd that are top 5 at his position a d top 10 in the league for dmen.
6) unlike dorian Armstrong isn't an idiot.