Red Hawk and Agon both shared a common problem, which was joining too late.
Others had followed Charles, sharing life and death, fighting side by side, but when the two joined, Charles no longer lacked Sacred-level hands. Agon was somewhat better off, but Red Hawk was downright frustrated.
Although Charles directly gave her a fleet, she was no more than a commander, and that was only because Charles lacked proper naval officers; otherwise, it certainly wouldn't have been her turn.
Both were among the most ambitious and youngest Sacred levels under Charles, and they were certainly not content to just sink into obscurity and become anonymous.
Charles pointed to Romios because he was at the Peak Holy Order, and also the President of the New World Conference; she pointed to Kresto because of his formidable strength, and he was also Charles' strongest card in hand!
Red Hawk and Agon were both afraid they wouldn't get their turn to enter the fray.