No, that's a bad understanding of the logic. You just need to screen for trends that apply to the player. Durzi won't just be "an OA". He'll be a (presumably) high scoring OA defenseman that has improved greatly since U18.
Say he does go back (I think it's far from a given)
Starting from the top, minimum ppg for overage defensemen in the O, post 04 lockout
D.Raddysh
Ryan Wilson
Centorame
Jake Muzzin
Collin Miller
Kwiet
Petrave
3x nobody, 1x Jury out/ good prospect, 1x 230gp nhl dman, 2 x top 4 dman. Pretty good hit rate. Favourable to that of a late 2nd.
Since you were previously interested in screening by use of draft slot, guess which two were deemed worthy of NHL draft picks prior to their OA year?
Another success story (admittedly from outside of the high end offensive performance sample) is Giordano. From the dub there's Spurgeon and Dillon.
Factor in that his U20 production slots in between Hamilton and Pietrangelo for post lockout d men...
I'm not saying that it's ideal if he goes back, just that it's far from a death sentence as a prospect if he performs.
For the record my pick would have been Hallander/Wise.
That is promising, but you would think a guy that talented who had such a high pick allocated to him would be worthy of the Marlies. I'm not holding this as much against Hollowell, as I am Durzi. I'd add Andre Benoit to the list due to being eligible for the 2005 draft (and it taking place in 04/05).
I also think it should be pointed out, that Pietrangelo and Hamilton were guys who passed not only the analytics test, but the eye test for NHL scouts. While analytics are helpful, they need to be balanced with actual observation. You also look at them, and they have a concrete track record and relatively linear development that makes it seem that their one season wasn't just a mirage. Generally, the best players are guys who hit in both groups.
Regardless of how these people have performed. I do think it sets off alarm bells if a guy who an organization used a 2nd round pick on isn't AHL ready by the age of 20. We would have said the same about Bracco last year, and it was basically a reason to write off Dzierkals organizationally. Higher-picks always get significant opportunity to play. The other thing with those samples, it is assuming he does repeat. Depending on what happens with Nick Suzuki, Owen Sound could be a pretty dreary offense. A regression into the below 1.0 would start being immediately alarming when you start adjusting for age.
The other thing is, most of those guys were overlooked and given opportunities late in the draft. The amount of guys who were PPG in their U-19 year old season and graduated eliminates a significant portion of the comparables for Durzi. If you realize a recurring trend for those guys they were late-rounders who hadn't shown much offense at the OHL level. Two of who did fail (Ryan Wilson, Andre Benoit) had previously shown offensive ability. Having watched the OHL for years, I don't think it is a good place to refine defensive technique if you are dominating offensively. If Suzuki is gone, the burden will heavily be on Durzi to drive the offence heavily, which could encourage bad habits that will be exposed at the pro-level, and it will not have him working on what we need him to work on.
I'm not saying its a death knell, but similar to other prospects in recent years who have had things happen, it isn't doesn't make me optimistic either (Brooks being sent back, and Dzierkals to the ECHL). I may be overly cynical when it comes to prospects, especially ones later in the draft (Unless its Bergman/Sweden pick, he's earned some faith). I'm hoping he makes the Marlies, and is capable of making an impact. Our best 2nd rounder in recent years accomplished that, and appears to be trending to being a solid top 4 defender. I may not agree with the picks or logic, but at the end of the day, I want the same thing as most here. Which is the Leafs to win and have great players/teams to watch.