If you don't wish to get into details of Ves's failed development path,(to help explain the total change in this player from a promising prospect with an exceedingly high probability of making the NHL- to what he has become today) , that's perfectly fine. But it is a lazy argument to simply assert that it has nothing to do with the orgs development plans and that he simply doesn't have the skill or special attributes, to succeed at the NHL level.
Of the players you mention, only Armia is comparable to Ves when looking at it from a development perspective. Both players were required to totally change their games , spending inordinately long in the AHL, being unnoticeable on the ice and making little positive impact. In the end, Armia succeeded (with his elite defensive stick as you call it) and became a valued winger after Buffalo traded him to the Jets. Perhaps Armia's successful transformation even encouraged the org to try something similar with Ves - we won't ever know of course. But they seem to have tried and the jury is still out as to whether Ves can take this same huge step.
Good analysis.
I think we tend to make a version of the fundamental attribution error sometimes with prospects -- if they aren't meeting expectations quickly enough, we tend to lay the blame on their shoulders: lazy, entitled, insufficiently skilled or hardworking, unwilling to buy into a coaching program, etc. But we know that orgs are culpable in misjudging the developing needs and curves of some players; there are dozens of examples, even recently.
Players who are desperate to make their NHL team and are on the cusp don't typically float around. We know from comments from Jets' coaches that Ves was tasked with remaking his game in order to fit onto a preconceived slot as a big-bodied winger with some speed and scoring and a sound defensive game. The kid works like crazy in practice and on the ice, every shift, every game. It isn't an effort thing. He isn't being used on the PP, and it's hard to get that dev time in when you're playing such restricted minutes and roles.
Then, is it a skill thing? I don't think so -- he rips that shot all day long in practice, according to reports (and my eye-test, once upon a time. Much more likely, I think, is some combination of a lag in adapting to the NA game and the brain speed to process it in real time, plus the confidence to make decisions without deferring to linemates.
I'm hopeful that he can get there, and become a useful player for us. Development isn't linear.