I was trying to come up with an hypothesis to circumvent the unknown and virtually impossible Matter-Antimatter Asymmetry Mechanism which ensured that matter dominates the universe. If energy splits into equal numbers of alleged matter and antimatter particles, then this mechanism is impossible to work.
So, I developed my hypothesis around the primordial energy splitting into electron-positron pairs, to form a plasma, but no quarks nor gluons. In my hypothesis, positive and negative charges do annihilate; so, a mechanism still needs to be developed to break the stalemate.
So my hypothesis treats electrons and positrons as oppositely charged matter particles i.e. no antimatter. That way, whatever happens we’ll end up with pure featureless energy or a matter-domiated universe as we see today. So, I suggested that the positrons somehow clumped together as composite particle that got orbited by electrons and formed the nucleons and structured like atoms.
My guess is that only protons were formed as they’re the epitome of stability. The protons will have 1 more positron in its centre and its partner electron remains in the plasma. As more and more electrons and positrons got removed from the plasma, there were fewer and fewer of them to annihilate. Hence, the annihilation process gradually came to a halt.
Then the protons collided with each other to form diprotium which sometimes captured an electron from the plasma so that one of the protons became a neutron; or one of the protons loses a positron to become a neutron. These events are still taking place today as per stellar evolution. Interestingly, so is electron capture and positron emission in radioactive isotopes.
Now, it’s understandable that the neutron formed out of electron capture would have the atomic mass unit published for it; but what about the neutron formed out of positron emission? Surely, it’ll have a lower mass than the proton. So, I agree with Jerry about the uniformity of masses of particles.