To me at least, hockey IQ relates to being able to play a multidimensional game. It's about complexity - not consistency. Braun is a skilled and consistent player, don't mistake my meaning hede. He however, does not think the game like Vlasic, Burns, Thornton, Pavelski, etc. His game, as good as it is, doesn't have a ton of depth. It's one dimensional. He does what he does.
As for DeMelo vs Braun - this is an actual situation. And to me at least, DeMelo played admirably in his time with MEV. Give him a full 82 game season and I suspect the few flaws he did exhibit would be polished away. Admittedly a small sample size, but we know he can play that role.
Schlemko on the other hand, is a far more exciting prospect. He brings the requisite experience need for a true MEV pairing, while also providing a nice mix of something new. He would, I believe, if given the chance, support MEV is ways Braun simply can not. His ambidexterity, superior transition and offensive game, combined with a more adaptable style, I think would allow that first pairing to become an even greater threat. Vlasic could build off his career season, with a partner capable of supporting him in all the right ways. This would ideally untether MEV more, let him play a less structured game, and provide him another option to run the offense through. As it stands, every team knows to tunnel MEV on the rush - simply because Braun isnt a threat. This is precisely why after a career offensive season, Vlasic was unable to keep pace in the play-offs. Did he contribute via positive Corsi generation and play-making? Absolutely. But the reason for Braun's sudden offensive prowess was that everyone was focused on MEV. Fix that, and you create a much more dynamic and competitive first pairing.
Braun isn't a bad player - and I absolutely think we can turn him for significant value - but given PDBs more fluid and aggressive system, I do believe we need a suitably fluid and capable partner to pair with him. We gotta adapt. Vlasic is our guy, Braun is the support - new systems mean new support.
Why would you need new support when the support Braun gave allowed the pairing to be one of, if not the best, shutdown pairings in the league last year? That's ignoring the reality that your definition of him as a player is flawed while pretending Burns isn't almost exactly one-dimensional the other way by the same standard AND ignoring the DeMelo having few flaws statement which isn't close to accurate.
This idea that Vlasic wasn't able to sustain a career offensive season that had 39 points in 67 games in the playoffs when he had 12 points in 24 games is based on what exactly? How exactly is dropping from 0.58 points-per-game to 0.5 points-per-game a legitimate piece of evidence for saying he didn't sustain it and it's somehow Braun's fault all the while not crediting him at all for any of the production Vlasic did have?