Calling all cecil defenders (s3 e8 spoilers)

Please tell me how it was a good idea for Cecil to imprison Conquest instead of letting Mark finish the job.

bro said it was for information and conquest's jaw is in at least 4 pieces rn, and by the time it's not he's probably just gonna tear open the prison, tank the explosions, and go kill more humans

or maybe damien darkblood will free him like the end of the episode was saying idk