I have come in my Father's name, and you don't receive me. If another comes in his own name, you will receive him.
If another shall come in his own name ... such a person would be like themselves, full of pride, arrogance, and conceit; and such a leader would be acceptable to them, as being like them and one of them.  Jesus was not thus, but demanded of the noblest of them (as in the case of Nicodemus) an utterly new life.