To be noted that those other talents excel in one single domain of road cycling, while Remco, like Pogacar, is competitive to the highest level in multiple domains (TT, hilly classics and stage races/GT's).
It took over 50 years to find a new Merckx. It's clear now who that rightfully is. Statistically it would have been nearly impossible to suddenly have 2 Merckx-like talents at the same time. Moreover, if that would have been the case, they would each be half a Merckx, cannibalizing each other and no one would even think to compare both of them to Merckx.