In response to the part of your statement in bold: http://en.wikipedia.org/wiki/Meson
Now, as I have said twice already, the strong force's repulsive nature at close range should be enough to keep the quarks separated.
A meson has a quark-antiquark pair that is bound. You have not shown even a hypothetical scenario where they are unbound and coexisting side by side, so that they might annihilate each other creating energy.
Now, as others have tried to explain more than twice already, "should be enough" is not a valid scientific argument at all. Why every unbound quark ever produced in an experiment has lived only for some nanoseconds but your quarks in the sun "should be enough" anything to make your argument viable?
"should be enough" is not a number, a distance, a part of a model, or part of a reasonable argument. It is just a desperate pray for the universe to take your side on a rant.