Lahabrea needling Gaius's resentment at the coming order to set up castra in Eorzea only to hide behind their walls and wait.
Frumentarium mentioned.
Black Masks mentioned.
Lahabrea
I entrust it to you, and no other. That this star might know the peace it once enjoyed...
Gaius van Baelsar
Your hopes for the star do not concern me, Ascian.
That is a killer interaction. Lahabrea pulling out a CLASSIC Ascian "I'm telling the truth but intend for you to misinterpret it" double-speak that Gaius should -- perhaps maybe even
would -- have questioned if only his reply wasn't an honest reflection of state of mind at the time.
Gaius's loyalty to the Emperor, never addressed in his going rogue, here connected to "Solus's" foundational orders, not only mentioned, but
used against him to inspire the act.
Recall that - in retrospect (we, and Square Enix at the time, probably, did not yet know the full state of the Empire's personalities and politics), Gaius's going rogue despite his loyalty to Solus perhaps makes more sense than it once did.
Gaius was willing to go act against immediate orders to serve earlier, higher-priority orders even in 1.0. As soon as Gaius detected Nael was deceiving Solus, he orchestrated his downfall at the hands of the Eorzean Alliance.
Impatience to conquer Eorzea and selfish ambition felt, to me, an insufficient explanation for that being the time and place he cashed out his loyalty.
But in retrospect - the Emperor bedridden and unable to rule, Varis coming to power, a conflict brewing between the Optimates and the Populares - Gaius was damned to lose regardless of who won. The Optimates didn't rule with Gaius's values - the strong had no obligation to rule the weak as (their idea of) benevolent patrons (unless they resisted in which case they were on the side of chaos and to be destroyed). The Opimates calling the shots in Eorzea would be disastrous, from his perspective. But the Populares would forsake their sacred charge to protect the star from the blight of the eikons entirely.
Perhaps he felt it was his only option to reclaim his strength and influence and restore his legacy, and that desperation set the stage for his successive moments of weakness - defiance, vanity, arrogance to the point of blindness in being taken in by a ruse he by all rights should have seen through.
Gaius and Lahabrea both being done in by arrogance leading to blindness and their own machinations destroying them is aces.
Lahabrea's "saturday morning cartoon" villain-ness addressed and connected to his own fading memories.
Lahabrea having a moment of reservation about Sabik and memories of his family trying to surface, all rejected in the name of loyalty to Zodiark and commitment to duty.