Those who don't consider Pogacar the best in the classics do so because they've decided not to consider the Ardennes and the Italian classics as classics.
When Gilbert, or De Vlaeminck in the past, won them, they were considered classics
The most contradictory thing is that people considered Remco one of the best classics riders, even though he's never performed in San Remo or the cobbles Monuments. Now it seems he doesn't even count in Liège...
So, to consider Remco one of the best in classics, what classics were they based on?