The Kitty Update

[Moberg]

Mate, why do you laugh? GMG and IMG are undeniably the richest non-house organizations. It is even hinted in the vanillia lore, especially in the GMG case. They are small House in economical output. Not sure about IMG, but its size surely would place it right behind GMG. GMG, surely, is the small powerhouse with one thing that Samura and Kishiro doesn't have - supreme independence.

If it wasn't true, both would be already crushed by their competitors. Don't forget GMG destroyed entire Rheinland fleet that dared to enter their system.

The GMG won for various reasons, but not because their fleet was superior. A battle between the Rheinland fleet and the GMG in open space would end up in the GMG being absolutely steamrolled. In GMG territory however, the opposite is likely to happen.
As for the IMG, they are more like Zoners in regards to base management and they are also not particularly large population-wise. IMG bases only have 2/3 of the population that a regular house faction has, even if you already leave the planet populations for house factions out of the equation. That their Magellan base directly supports open outcast allies and gladly aids in indirectly financing the IMG's arch enemy in the Taus through Cardamine trade makes it obvious that the bases are independent from each other to a degree and resemble zoner-like structures.
The faction has simply been overdeveloped in the past, an issue that was already admitted and will be worked on soon enough.