Is there a theoretic temperature where single quarks might become individually stable? This question is what lead me to ask this.    Strong force between quarks that are out of causal contact and my understanding of the standard model is that the answer is no - but the standard model isn't necessarily absolute.
Like, for example, when the strong, weak and electromagnetic forces combine at some obscenely high energy state - do solo quarks become possible? 
If this article is correct, I'm guessing the answer is yes, or, at least, maybe:   http://physics.aps.org/articles/v7/61   but the article is for Top Quarks.
 A: One is speaking of models, which are validated at low energies and are evaluated at energies much higher than laboratory energies.
In Grand Unification of all three forces weak, strong and electromagnetic,

In the 1970's, Sheldon Glashow and Howard Georgi proposed the grand unification of the strong, weak, and electromagnetic forces at energies above 10^14 GeV. If the ordinary concept of thermal energy applied at such times, it would require a temperature of 10^27 K for the average particle energy to be 10^14 GeV.

These condition can theoretically happen at the very early universe in a cosmological model, as the Big Bang model.
What does unification mean? That the exchanged bosons are essentially all one boson  and the spin 1/2 particles are one "particle" described by the group representation structure. In this sense, in the extreme conditions of the early universe if electrons can be then called free, so will quarks be free. 
They cannot be free in laboratory or cosmic ray situations.
