I meant what I said:
Pharaoh was the ruler over Joseph and all of Egypt and Joseph was the ruler over all of Egypt.
Pharaoh never stopped being the ruler over all of Egypt when Pharaoh made Joseph the ruler over all of Egypt with him.
Two people, Pharaoh and Joseph, that can both be called the ruler over all of Egypt.
Here's the problem with that.
Joseph wasn't the ruler over all of Egypt.
So the advice was good in the eyes of Pharaoh and in the eyes of all his servants.And Pharaoh said to his servants, “Can we find such a one as this, a man in whom is the Spirit of God?”Then Pharaoh said to Joseph, “Inasmuch as God has shown you all this, there is no one as discerning and wise as you.You shall be over my house, and all my people shall be ruled according to your word; only in regard to the throne will I be greater than you.”And Pharaoh said to Joseph, “See, I have set you over all the land of Egypt.”Then Pharaoh took his signet ring off his hand and put it on Joseph’s hand; and he clothed him in garments of fine linen and put a gold chain around his neck.And he had him ride in the second chariot which he had; and they cried out before him, “Bow the knee!” So he set him over all the land of Egypt.Pharaoh also said to Joseph, “I am Pharaoh, and without your consent no man may lift his hand or foot in all the land of Egypt.”And Pharaoh called Joseph’s name Zaphnath-Paaneah. And he gave him as a wife Asenath, the daughter of Poti-Pherah priest of On. So Joseph went out over all the land of Egypt. - Genesis 41:37-45 http://www.biblegateway.com/passage/?search=Genesis41:37-45&version=NKJV
Pharaoh, who was a part of Egypt, was still over Joseph, which means that Joseph COULD NOT BE over ALL of Egypt, because if he were, he would also be over Pharaoh, which he was not.