Euro kids that play in men's leagues are just about universally under-valued by these sort of models. They fall into a weird gap where they're too talented for youth leagues where they'd put up gaudy numbers, but they're not getting substantial (or sometimes even regular) ice time with the men's team and, so, don't score much. Prospect stat-based models are also notoriously shit at valuing defensemen, so I'm sure there's plenty of weird rankings in that regard, too.
Still, Quinn is having an an insane AHL season, and I think it's fair to expect him to be immediately productive when he becomes a full-time NHLer next year.