I took Geir's calculation as essentially adding a generational aspect by spreading Garnfellow's values over 30 years of activity.Could be if that number is by planetary population, that number is per generation and not per year. That would mean 4,000 per year from that one planet. Much more reasonable given how the setting is described. It is still a lot once you add up every planet in the Heirate.
Following Garnfellow and Geir with 90% drop-offs (so 300 'ihatei' per million), 7 trillion Aslan might generate roughly 2.1 billion 'ihatei' (which includes some landless htatei) who go a-roving each year. (The population includes about 408 billion ihatei in the narrow sense, most of whom find gainful employment inside the Heirate.) Some proportion of the 2.1 billion will presumably be doing their ihatei thing inside the Heirate because of the distances involved; some (possibly the majority?) will be heading to the rimward frontier. Though at this scale we'd probably be looking at billions more Aslan moving in clan-sponsored or corporation-sponsored colonisation efforts.What does that math work out to for 7 trillion total Aslan?

