Is an all powerful God not all powerful enough to do it Himself, without the "help" of others?
Did the all-powerful God *have* to use a human vessel to come to Earth?
I think there are other examples where our all-powerful God chooses to enlist the help of others who are not all-powerful. He is all-powerful, but also humble.
Of course He is, just like He is powerful enough to write every single word in every single book in the Bible by Himself, or impart all that knowledge and wisdom in some other way, but He chose to use human beings as go-betweens to write those words and books of the Bible for other human beings. (See post #537.)
However, God freely chooses to use human beings as go-betweens with other human beings for lots of things, including physically writing every single word in the Bible.
(You do agree that God did actually, truly use human go-betweens to physically write every single word in every single book in the Bible, don't you?)