Bratt is a solid middle 6 winger. Likely developing Into top 6 guy. Dunn is already a true top 4 LHD and might be a top pair.

Devils add considerably.

Jersey adds a bit

Devils should add something.

I won’t discount Dunn saying he can’t be a top 4 guy since he hasn’t been given the opportunity but he’s far from top pair. His analytics look great because he’s being sheltered on the third pair and faced the least amount of quality competition.

This is true. Tbh neither Dunn nor Bratt have been given big enough roles to indicate what label to slap on them. Dunn has obliterated lesser competition and he has all the tools to be a solid offensive d-man in the top 4 but the Blues really shelter him and will probably continue when you look at the depth chart. Bratt will have plenty of seasons over his current high of 35 pts, and his all-around game has been improving ever since he broke in.

I'm with the rest of the commenters so far that the Blues would ask for more if they're moving Dunn; maybe something like Bratt and Foote for Dunn and Barbashev or something like that.