Bradesmaen
TheBrownDog
That 2021 Red Bull was easily the 2nd best car that year.I don't think its essential to do it at multiple teams, but rather do above expected in a car that isn't considered the best on the grid.
Max has still driven solidly in the years that Red Bull were not the best car, and you could arguably say that his 2021 championship win was in the 2nd best car. I think he'd probably need to win another championship in a car that is not the best on the grid to be put into GOAT conversations.