So if I post here a bunch of links of guys like Sushko and Buinitsky who, despite being a solid CHL players, didn't do well at all in D1A I will look smart and you will look stupid? Can I make a case now that D1A > OHL? This is how it works?
You could try to do it but you'd be wrong. The heavy body of evidence indicates that CHLers do well at the D1A. I stress trends and not exceptions. You're taking a handful of exceptions and trying to establish them as trends. CHL players and CHL rejects have done incredibly by and large, especially older ones who aren't subject to coaching bias like many draft year kids. Many CHL players tend to be younger or in draft year and face more senior favoritism so the tend is not as strong but we see that older CHL players or former CHL rejects have done incredibly. Exceptions exist of course like Yeryomenko was wonderful. This year had a smaller number because of Latvia's ascent and lower Austria/German totals. Still, Christof Kromp, Jakob Mayenschein, now as older CHL rejects were fantastic. Go back a year for Dominic Zwerger, Flo Baltram, Mario Huber, Rodrigo Abols, Andreas Eder, Martins Dzierkals. Go back another year, Dmitri Ambrozhiechek, Markus Soberg. Go back another year, Arturs Gavrus, Nikita Jevapalovs, Mikkel Aagard, Roberts Lipsbergs, Edgars Kulda, Oliver Bjorkstrand, Nikolaj Ehlers, Mads Eller etc. Of course, some do only decent like Dario Winkler or the aforementioned Buinitsky, but you have absolutely no point with that. 0 points and 1 point rotate as the most common number of points scored by players going to worlds. CHL players, like NAHL players are multiple levels of significance in performance above the average player.
You won't have guys like Texier or Pettersen playing in the NAHL but a depth player in the NAHL will be better than that in U18 D1A, obviously. But like I said, as a general comparison, U18 D1A is way closer to tier 2 than tier 1 or 3 so it wasn't that far off.
Pettersen is a decent USHL player, he'd be a very good NAHL player but the idea that you won't find a player of his caliber in the NAHL is wrong. His conversion factor to NAHL points isn't ridiculous.
And again, please show evidence. Hungary's U18 played in the Mac's AAA tournament for Canadian AAAs in the west, they didn't make it out of the group stage. Belarus, an Elite tier team, won the tournament but had a few pretty close games. Multinational club teams like Red Bull that are generally stronger than U18 national teams finish 2nd and 1st in a AAA then a High School tournament. If you need evidence of that strength, the French U18 team that is leading this U18 tournament lost 2 of 3 against the Slovak, German and Swiss U17s. Red Bull Juniors split the recent series against the Czech U17s without Martin Pospisil from the Slovak U18. Jeppe Meyer, Norway's top scoring D, is a AAA kid, one of two on the team. Hungary's team also has a below-average WSHL player and a low division Swedish team player. Norway's team scrimmaged during the season against D2 U20 teams and D1 U18 teams from Swedish clubs. You really think Swedish U18 clubs are NAHL level?
The opinion I'm offering is not at all extreme. A match between North Jersey Avalanche, Fox Motors or Victory Honda and say the German U18 National team I could see the German team contending, but some people would take the AAA team in a heartbeat.