I know they only make up 6% of the population but it doesn't take much to come up with an occupation force and base of support among the populace, especially if you are Russia. I wouldn't be surprised if Ossetians make up a large part of it.
Chechnya has a Russian population that is nearly as large, 3.7% versus 5.7%, and it was a mess to try and control. If Putin and Medvedev make the mistake of trying to occupy Georgia they will not only have nearly complete condemnation from the international community but also another Chechnya but on a much larger scale.