I think Covadonga times were about the same for Roglic and the chasing group (with aboug 1'30'' of difference at the start and at the end). As for consistency I'm not sure we have large enough sample. One could say that Roglic's PDBF performance and some climbs at Vuelta'20 weren't good compared to his standard level. As for general climbing level obviously Roglic is the only one who can be compared to Pogacar, the rest is not at their level (speaking about average performance, obviously guys like Yates or Lopez showed high peaks).