I can’t find any recombination dynamic. Once matter is disassociated and accelerated to velocity, both the EM and the G forces seem to be neutralized. The solar wind for example, and I dare say flares should have much more velocity than star and galactic wind.
So some dynamic to slow the particles is needed for recombination. And because of the quantum levels, any recombination into dipoles, H1, should involve emission. But we detect none of it.
These high velocity particles would not interact with light. And the galactic density and inter galactic density is impossible to detect and measure. It’s probably impossible to inventory cosmic matter. Most of it could be undetectable. Regular matter. Neutralized with velocity.