So who was on the Throne while He was gone?
I'll just quote you the revelant scriptures:
'Let this mind be in you, which was also in Christ Jesus:
Who, being in the form of God, thought it not robbery to be equal with God.
But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men:
And being found in the fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross.
Wherefore God also hath highly exalted him, and given him a name which is above every name:
That at the name of Jesus every knee should bow, of things in heaven, and things in earth, and things under the earth;
And that every tongue should confess that Jesus is Lord, to the glory of God the Father.' Phillipians 2: 5-11.
When Jesus was incarnated he was totally dependent on God the Father, to serve as an example to us, Chistians, and to the world. The Father and the Holy Spirit were on the throne, but that doesn't change the nature of Christ, as we see in Saint John.
'In the beginning was the Word,
and the Word was with God, and the Word was God.
The same was in the beginning with God.
All things were made by him; and without him was not anything made that was made.
In him was life; and the life was the light of men.
And the light shineth in darkness; and the darkness comprehended it not.
There was a man sent from God, whose name was John.
The same came for a witness, to bear witness of the Light, that all men through him might believe.
That was the true Light, which lighteth every man that cometh into the world.
He was in the world, and the world was made by him, and the world knew him not.
He came unto his own, and his own received him not.
But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name;
Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.'
St. John 1: 1-14.