If Demidov and Lindstrom are gone (meaning max 2 of Levshunov/Silayev/Dickinson/Buium are unavailable for STL), I would do
5 + 57 for 16 + Dvorsky
provided I have a 2nd deal ready to move up from 16 with 26 and other B+ prospects (to 9-13).
I don't expect that deal to be particularly liked by anyone else, because Dvorsky wasn't too liked on our board 12 months ago (few know how good he did this year in the CHL), and it sounds expensive for STL, but you don't usually get a shot at a potential 1D when you want to build the deal around the 16oa (to clarify I think Dvorsky > 2024 16oa).
I just don't see a reason for the thought in the first place of moving one of our top prospects to move up from 16. This draft class has been widely viewed as pretty weak. Snuggerud has largely exceeded his draft pick position. I don't see why our front office would be upset with Dvorsky's progression, especially with how highly they viewed him at the time of the draft.
Here's the outcomes that are possible.
Moving Dvo/Snuggerud + 16 and getting a #1 - probably worth it for the Blues
Moving Dvo/Snuggerud + 16 and getting a top 4 defenseman - not worth it but not really potentially disastrous if - we're trading a young top 6 player and 16 hits
Moving Dvo/Snuggerud + 16 and getting a guy who gets NHL time but never really becomes a truly important piece of the blueline - absolutely disastrous.
There's so much risk involved with something like this - at least with the two prospects we have we have seen their post draft development and are really excited and happy about it. Why take the chance on throwing one of them away to slightly improve our odds on hitting the lottery in this draft?
There are a lot of defenseman in this class who are projectable with some flaws, and not many that don't have some noticable questions.
Then there's also the guys who have shown some things that could potentially jump into that first group but due to some issues haven't really been seen enough due to injury or haven't really played in a competitive league.
I'd say the first list is probably Levshuvnov, Buium, Parekh, Dickinson, Yakemchuk, Silayev
Then I'd say you could fit Jiricek, Solberg, maybe Kiviharju in that 2nd group.
There's a lot of options there, the 2nd round also has a pretty long list of guys that have some things that are intriguing on the defensive side.
I just can't imagine taking a heavy risk of losing out on a 3rd tier pick and trading a guy who would almost assuredly be in the 2nd tier of this draft is a good idea to try and find a better positional fit when none of it is guaranteed.