You miss the (most important) point.
When people leave Purgatory, or leave the state that purgatory is, it is like having "graduated’ to heavenly bliss.
In eastern the concept one does not graduate into heaven from another supernatural state (unless they are somehow sprung from Hell).
We are created beings, and therefore not ever perfect. The deifiying process continues in the light of God indefinitely (or essentially…forever). The only perfection is God, and we should never cease to become more Godlike…and never finish.
Therefore there is no “Final Theosis”, no end to that process. What Dragani is (mistakenly) trying to associate is Heaven according to our understanding with the Latin construct of Purgatory. The whole idea makes no sense whatever.
Has this teaching been official promulgated by an ecumenical council, or is it just “personal opinion” which contradicts the “personal opinion” of Mark of Ephesus:
“But if souls have departed this life in faith and love, while nevertheless carrying away with themselves certain faults, whether small ones [what Catholics call “venial sins”] over which they have not repented at all, or greater ones for which - even though they have repented over them - they did not undertake to show fruits of repentance: such souls, we believe, must be cleansed from this kind of sins but not by means of some purgatorial fire or a definite punishment in some place.”
…and the pan-Orthodox Council of Jerusalem:
“And such as though envolved in mortal sins have not departed in despair, but have, while still living in the body, repented, though without bringing forth any fruits of repentance…of these and such like the souls depart into Hades, and there endure the punishment due to the sins they have committed. But they are aware of their future release from thence…”
…and St. Clement of Alexandria:
“The believer through discipline divests himself of his passions and passes to the mansion which is better than the former one, passes to the greatest torment, taking with him the characteristic of repentance for the faults he may have committed after baptism. He is tortured then still more, not yet attaining what he sees others have acquired. The greatest torments are assigned to the believer, for God’s righteousness is good, and His goodness righteous, and though these punishments cease in the course of the expiation and purification of each one”
and St. Gregory the Great:
“As for certain lesser faults, we must believe that, before the Final Judgment, there is a purifying fire. He who is truth says that whoever utters blasphemy against the Holy Spirit will be pardoned neither in this age nor in the age to come. From this sentence we understand that certain offenses can be forgiven in this age, but certain others in the age to come.”
Why should I believe your “opinion” instead of the above?