The G5 are fighting over one auto-bid, the P4 each get one. I think you are mixing up the bids and the bye week qualification requirements. If the highest G5 is ranked higher than any of the P4s, then the G4 gets a bye and the lower ranked G4 does not, but I don't think there's any scenario where a second G5 champion gets an auto-bid (an at-large is technically possibly, but not a second auto-bid).