Any specific reason you think it is not required? Why would the son of God walk that great distance to be baptized by John the Baptist? Why would he make sure it was a descendant of Aaron?

oh wait.. now I understand why you mention Aaron... because now you will try and say that John had priesthood authority because of his father having the Levitical priesthood..

So let me point this out... John didn't take any levitical vows, he lived in the desert wearing a sacloth and eating locusts and honey... so you would be assuming he had priesthood which would put the burden of proof on you to show his priesthood when he obviously didnt follow that life path.