I realize that that is speculation but based on my knowledge, history and understanding of the area that is is good theory.
And since your "knowledge" of their history is as foggy as your knowledge of "Ukrainian" history you may safely bin your "theory".
Ossetians are descendants of ancient Alans, Scythian and Sarmats. Their language is of Iranian group. They inhabited their lands from, well, the times of ancient Alans, really... There was time in history when Osetians dominated Iberia, one of Georgian states... In the middle of the 6-th century Byzantine Emperor put an Osetian in charge of Ksany, another Georgian province... At the time Georgian territories were controlled by Byzantia, Persia and Arabs.
Georgia as an independent all in one state was formed in the 11 cen. and flourished between 12 and 13 cen.-s.
In 13 cen. Georgian kingdom was divided onto few independent Georgian kingdoms that suffered from Tatar-Mongols. The start of major animosities between Georgians and Osetians dates back to 13 century.
Both Osetia and Georgian kingdoms suffered greatly from the wars with Iran, Turkey and other Caucasian nations. On few occasions Russia sent its army to help Georgians and Osetians.
In 1782 Georgian ruling class issued a decree discriminating Osetian people and prohibiting marriages between Georgians and Osetians.
In the 18 cen. Osetian ruling elite appealed to the Russian Empress to admit Osetia into Russian Empire. Their plea was granted.
In 1782 Georgian (Kartlo-Kahetian, since Georgia at the time consisted of few kingdoms) king asked Russia for protection (Georgievsky pact).
In 1795 Persian Shah Aga Khan Mohammed, dissatisfied that Irakly II failed to appear at his coronation and so expressed its independence, summed troops to Tbilisi. They rounded up civilian (80 000) and slaughtered them. In Tbilisi an image of Virgin Mary was brought to the bridge over the Kourou, where more than three thousand men were gathered and told to undress. Shah then ordered everyone to come to St. Mary and desecrate her image. Those who refused were beheaded and thrown into the river. Georgians who tried to flee Georgia were caught and massacred. Many Georgians loyal to Shah took part in the massacres. Georgian king Irakley wrote letters to Catherine II begging her to save Georgia. Three detachments of Russian troops (militia generals Burnasheva, Gudovicha, Suhotneva), located in the Caucasus, and an Ossetian detachment of 500 soldiers came to the aid of Georgia. In Petersburg, it was decided to urgently equip the ten thousandth army and send it to Tiflis. Mohammed Aga Khan retreated...
In 1797 Mohammed Aga Khan once again went on Tiflisu. Only his death saved the city.
In 1801 Russia fulfilled the request of Georgian king George XII and took Georgia into Russian Empire.
Since then both Osetia and Georgian provinces were pretty much run by their own ruling elites.
After the revolution, Georgian provinces were put together to form a republic of Georgia. In 1922 Osetia was divided (by Stalin) into two parts: N.Osetia was left in Russia, and S.Osetia was given to Georgia.