Theory extension: overflow of love and revealing of holiness.

God is love. He desires to share His love in its fullest extent. This is the source of creation, redemption and judgment. The wholeness and complete revelation of God could not have been known otherwise.

Argument from Holiness:

Judgment's source is God's holiness but if there were no creation, there would be no judgment for there would be nothing to judge. Judgment was a required action in creation, but not a motivation because created beings were meant to walk with God. Because beings fell, judgment existed. The holiness of God is only expressed fully in judgment. Before judgment, God was holy, but His holiness was not known.

Ultimate conclusion:

Creation exists because God desired to reveal Himself fully.

God created with the foreknowledge that creation would fall because He saw that the good of the revealing of His true character and the consequences thereof would be better than His remaining unrevealed. He could have stopped after creating angels because Lucifer would fall and be judged and therefore His holiness would be revealed. He could have at that point revealed the rest of His character to angels by showing them grace, however, He chose to use man to reveal His grace. Why? Perhaps it has something to do with the angels' beings, that they are eternal and once they made a choice for Him or against Him its permanent. The postulation will continue. What do you think?