[ianai]

Seems like a not bad idea. Especially if the antiparticles accelerated away before they could interact. But the two types of particles should be mutually attracted. They’d also have to appear in an organized way to avoid collisions with other particles.

Maybe there wasn’t a Big Bang, but instead a “large shearing”. Ie two “sheets” (like higher dimensional objects) started in contact with one another and moved apart/were pulled apart from one another. Before the shearing, lots of energy existed with little or no opportunity for massive objects to form. During the shearing the particles adhered to one sheet (for whatever reason) and the antiparticles the other.

(End of my out there positing)