[POWER RANGERS] Why is blue automatic leader after red ranger

Hi Friends, over the years in one or two episodes we have seen red ranger for some reason is absent.Blue ranger automatically becomes the leader of team which i feel is not justified. He is been termed as no 2 unofficially. Instead what i think is red ranger should nominate the leader in his absence who could be pink,green,black or yellow.It will give red ranger more power of decision making.