Anyway as players, we should probably start asking how we think the Trust ought to divide the Colonies.
Are you talking in general terms about colonies, or specifically about the (expected) captured Orc planets?
We already have agreed to a model for establishing colonies with the rest of the Trust.
If it's about the specific targeted Ork planets then we don't have a lot of the details to guide us, but there are the following points we know:
Dannan is a Fortress world and the furthest out from the Trust. Also where the major Ork shipyards are.
Dooneeva is the closest to the Trust and the center for Gargent production. Does this mean it has significant valuable natural resources?
There is also a third planet in between Dooneeva and Dannan. We know next to nothing about this planet.
One option is to just take the three highest population Trust members: Midgard, Vanaheim, and Svartalfheim and divide the planets between them. (Avernus is #4 in population size)
Dannan as a Fortress world and the most exposed makes some sense for Avernite settlement (due to our expertise in Siege Warfare) especially since the Orks there are likely to take a significant amount of time to fully dislodge. As the most distant from the Trust, it does not seem like it would make sense to base an large shipyard facility there (so Vanaheim's expertise would be wasted). Svartalfheim might also be well suited to Dannan as they also have significant siege experience.
If Dooneeva has significant natural resources Svartalfheim/Vanaheim might be suited to organize colonization there. Being close to the Trust it might be beneficial to have a significant naval presences there, perhaps as the forward base for naval operations in Garkill's domain. Naval defenses there might also help in increasing protection of Alfheim.
If any of the worlds have significant amounts of terrain suitable for mechanized infantry that might make it a good candidate for Midgard colonization.
Until we know more though I don't think we can reach a strong position.