He was not concerned about the Roes Civilization. Such a small civilization, refraining from taking action all along, was only because they were constrained by the public opinion in the Star Space and the rules set by the Three Great Civilizations.
The Three Great Civilizations could deal with them at any time, but without sufficient reason, randomly exterminating low-level civilizations was a grave crime.
The Three Great Civilizations absolutely do not allow the civilizations under them to annex each other and grow rapidly.
This is truly a classic example of "the law encourages corrupt officials but forbids commoners to light lanterns."
When it really comes down to it, a civilization occupying less than a third of just one of the eight spiral arms within a star system is simply impossible to be a match.
What he truly worries about has always been that legendary high-level believer.
