First line of the post- "Acknowledging that any prospect can completely bust and flame out"
It goes without saying that for all but the top handful of prospects league wide the raw probabilities say that any "projection" higher than outright bust to depth-fringe NHLer is betting against the odds. Any and all discussion of upside beyond that is reading very fine lines, and under the mutual understanding that you're talking about what it's reasonable to expect them to turn into IF they beat the odds and turn into anything at all.
The fact is that that you don't draft a Danford at 31 because you think the upside is a right handed Benoit. You do it because the upside is Carlo/Cernak/Lindgren/Middleton/Manson, Vlasic (Chicago) ,Dillon, Edmunson. The kid was voted by coaches to be best defensive defenseman in the OHL eastern conference as a 17 year old, while also placing top 3 in shot blocking and hardest worker. He's got NHL size. Scouts see the skating and tools that gives them hope of it translating. The Wheeler's of the world see the lack of production and offensive upside and so lazily cap ALL upside
So yes. It is fair to project him as a 3rd pair defenseman. No one should be disappointed with that result. But it's not an absolute, everything goes right best case scenario- there is legitimate reason to hope for more and value him higher. Minten is in the same boat.