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And if, as you theorize, Satan was created "good" but then he fell, how is Satan any different than Adam?

Satan is different from Adam in that, being a spirit weithout a body, he cannot be tempted. Angelic fall is much more grave than Adam's. There is no redemption for the fallen angels. God even created the Lake of Fire specifically for the devil and his angels, but not for men. That an unknown number of men will follow Satan into the Lake is not God's doing; it is their choice. God will simply send them where they chose to be.

It is clear that those who clothed him and gave him water and all that allegorical stuff (in other words who did right things) will be the sheep, and those who did the wrong stuff will be the goats. Nothing predestined there. God knows, but he doesn't make out decisions.

No wonder the EO has a difficult time defining evil and men's fallen nature.

The EO have no problem defining evil and man's fallen nature.

At the dawn of creation, before God made the visible world, but after the creation of the angels, there was a great catastrophe, of which we have knowledge only by its consequences. A group of angels opposed itself to God and fell away from Him, thereby becoming enemies of all that was good and holy. At the head of this rebellion stood Lucifer, whose very name (literally meaning ‘light-bearing’) indicates that originally he was good. By his own will he changed from his natural state into one which was unnatural; he opposed himself to God and fell away from good into evil. [ An Online Orthodox Catechism ]

The Church never taught that evil was coeternal with good and that evil was a creature of God.

Christian theology viewed the nature and origin of evil differently. Evil is not a primeval essence that is coeternal and equal to God; it is a falling away from good, it is a revolt against good. In this sense it would be wrong to call evil a ‘substance’, as it does not exist in its own right. As darkness or shadow are not independent beings but are simply the absence or lack of light, so evil is merely the absence of good [Ibid]