Huh.
OK, I'm fine with the Darrians getting Imperial technology. That's established in canon.
But I'm rather leery of all this sooper-dooper TL16 military technology that everyone seems to think the Darrians have in the basement for a rainy day.
For one thing, and given Darrian culture I really do think this is important, the pre-Maghiz Darrians had no military opponents in their region. The only resistence to their expansion in the early years was environmental, not another species or political power. They had NOT contacted the Zhos and the Sword Worlders had not arrived yet. Given what we know about 'modern' Darrian culture, it seems very unlikely that the Confederation would have expended such a huge percentage of the GDP to fund a military with literally nothing to do. Especially when there were better things to spend that money on... from the Darrian point of view, defense spending is for just that, DEFENSE, not expansionism. They've never had an imperialistic or martial nature in their society, so I'm simply not seeing how they'd 'waste' resources on multiple regiments of powered armored troops armed with neural rifles and fusion guns. The Darrians are now, and were then, colonizers and scholars, not militarists.
With all that said, sure the Darrian Confederation Guards have TL 15 Battle Dress. But they have the same models as the Third Imperium, sized appropriately for the Darrian physical frame. MAYBE that amounts to 10% size/weight reduction, that's at the most.