The Nirai faction emblem used to be something else before the mothdrive's invention/discovery. I'd have to dig in the manuscript of Revenant Gun for it but it was like a ringed planet or something. I'll get back to you in a bit?

Also, the numerological aspect is ridiculous. Think about companies and release dates--everything has to be scheduled around the high calendar, which is often not great from a business/economic standpoint.