Almost 100% accurate, we do know that the cabal sent a distress signal to the head of the empire plus if you consider the whole grimoire though we do know that Oryx has 2 other sisters (1 being the war focused one with less magic) that might attack at any time, the queen's brother is alive for sure he's on Mars with his crows, also the queen herself might still be alive (i hope so) as said in the grimoire about her brother after he woked up on Mars, "The countdown to the shield’s deactivation pulsed. He tried again, to home in on her, to find if she truly gave herself for this battle. He felt close to something, a hum of starlight, then shield deactivation broke his focus." -grimoire allies, the queen, the aftermath. Last thing, we don't know a lot about the cabal expedition on Mercury, we can't say it has been a failure neither a success just that their looking for something that might be pretty important for the vex on Mercury.