I don't quite remember, but I feel none of Brajkovic, VdB, Kruijswijk, Mollema, etc were that hyped. They were kind of treated like potential in the hypothetical they'd make an improvement to a level they'd never shown before. They could hang on for dear life for places, but I don't think that's the sign of a future GT winner. These guys were also pretty much the same generation as Andy Schleck, who had the megahype down locked down tightly.
IIRC, I think the big deal was sort of "yeah Schleck is the best of the lot, but it's Nibs vs Gesink for 2nd place of that cohort".
All in all, I think the most distinctive trait of riders who are hyped but will never break trhough to that level is the total lack of top level performances. And you just can not say that for Pogacar. He's a proven winner from the get go.