Well, I've raced quite a bit, and I have also experienced similar when you are suffering then someone rides off the front and you think WTF. But I still think that is an example of subjective bias.Bull-sheet. Look if he was mind-boggled, it's because he hasn't seen anything like it. Anyone who has raced knows class when he sees it, at the various levels in relative declination. Someone attacks and it's like a rocket taking off and you say what the fook?!? Not gonna get that wheel. When Valverde is the one saying it from first hand experience, there is no bias, but pure honest sensation.
Knowing Remco's ride in the worlds Valverde's comments are not surprising - yes, even a pro with his record and long career. I think we know the type of rider AV is means he could never ride off the front like that, so of course he was shocked.
But as I mentioned upthread, if he is truly as good as AV's comment suggests (and you inferred by quoting it) we won't have to wait long for the confirmation, so I think we need to temper the hype until history unfolds.