I don't understand this reasoning. There were no boni seconds to be earned at the line, there was no climb in the final 2k, and we're talking about a two minute distance. Why would any of Vlasov, Carthy, Landa not pull because they feared getting dropped by Bernal? Where exactly would Bernal place an attack that would allow him to stay away from his companions? How many seconds could he possibly take on them?
I think they all pulled for what they were worth. If Bernal did most of the pulling, it wasn't because the others feared he would drop them, but because Bernal was the strongest and the others couldn't give anymore. Same in the chasing group where it was only Evenepoel who was pulling. If Bardet or yates could have gone harder, they would have taken a pull.
At least, that's how i see it.