Not sure who you were listening to/watching, but the predominant take leading up to the draft was that Wallstedt was a generational type goalie prospect on par with the best we've seen in recent years. And that Cossa was only, in the late hour, entering the conversation due to his raw attributes mostly. And that didn't change on draft night or after, regardless of what a handful of heterodox analysts and pundits stated..And that can often be hyperbole also, like with Lafreniere who was never a generational talent, but in Wallstedt's case, all signs pointed to it being wholly true. I'm sure there were some pundits that were putting Cossa's raw attributes ahead of Wallstedts superior talent and ability.
And yes, I do think it is a matter of being "too clever". Meaning, anyone putting Cossa above Wallstedt then or now, is being too clever and only fooling themselves. It can happen to the best of them.
But this one is clear, especially today, but leading up to the draft as well. It was only within days of the draft from what I remember that this hyperbole about Cossa started ramping up and people as you say, began drooling over his raw attributes. Which happens leading up to many drafts, NFL, NBA, no different. And every draft numerous such errors in judgement are made. Occasionally they work out of course, but more often than not, they don't.
Can compare this a bit to the upcoming NFL draft. Someone is going to play the lotto on Anthony Richardso nand pass on Young/Struod quite possibly. With his ceiling I am kind of expecting it to happen. And they could get extremely lucky and he could turn into probably the most complete athlete QB that has ever played the game. Or he might end up being what many are worried about, just a super athlete trying to play QB, like many before, who tend to fail or at least not to live up to expectations.
But that's what situations like that are, playing the lotto. When you have as close to a sure thing as possible in front of you, and you pass it up reaching for something that may never actually be there and is only in "potential" form. In the case of Wallstedt and Cossa however, I don't know if it's exactly like Richardson in respec to the actual ceiling of the players involved. Even though Cossa is taller and has the raw attributes, I still don't think he will ever be better than Wallkstedt as the difference between them, in terms of what is necessary for a goalie, is not nearly as wide as the difference in ceiling in the above NFL situation. But the comparison I think is sound otherwise.
Anyway, look I'm not saying Cossa is bad or that he will turn out a failure or anything. It's just that the odds are nowhere near as good as for Wallstedt and I don't think ultimately the ceiling is as high even. But guess we will have to wait and see. Ultimately, it comes down to this. The best Cossa could probably hope to be is as good as Wallstedt seems to be. So why take on risk when it doesn't seem probable the outcome would be superior? If you stand a 75% chance of winning a million bucks if you bet on choice A, and you stand only a 50% chance of winning a million bucks if you bet on choice B, why would anyone bet on choice B? You don't gain anything by taking on the extra risk and worse odds. You just lessen your chances of winning the prize.