Tawnos
A guy with a bass
That would be my guess. We need RDs desperately. Everyone is looking at forwards with exciting stats, but we have 8 forwards 24 or younger capable of top-9 play (Buchnevich, Kakko, Chytil, Kravtsov, Lias, Howden, Lemieux, Strome) plus Zibanejad is 25. Barron and Vinni may get there also.
We have a ton of LDs: Skjei, K'Andre, Hajek, Rykov, Lindgren, Crawford, Rag. But what do we have on the RD? ADA, Pionk, Keane. Literally every RD prospect must hit his ceiling to get us where we need to be. That won't happen. Throw in Soderstrom and the situation looks much better. Throw in Soderstrom and Fox, and suddenly things look downright fun.
This is my thought process, though as others pointed out Lundkvist is a RD. I'd add Reunanen to your list of LD (though I'd probably remove Crawley). The differentiation is pretty stark. And, as you alluded to, the odds of prospects making it are pretty low in general, so we definitely need more quantity at the RD position, as well as quality.
That being said, most of the reason I wonder about Soderstrom comes from what I've read about his intensity and work ethic.