Many times-- not always -- the "B" team crushes the "A" team. Being underdogs promotes teamwork.

It's clear you don't understand what A and B people are then. If the "B team" is crushing the "A Team", then they aren't the "B team". Also, notice how you switched "player" with "team"? The quote is "A players hire A players", not "team".

The point is that top tier individuals typically hire top tier individuals. The reason this notion isn't so clear cut is because its hard to identify A players before the fact. It's a retrospective truthism.