The horrible joke is that he would definitely have grown a little more and not been so tiny if he hadn't been attempted to be brutally murdered by his parents ghosts requiring him to 'fix' the problem with magic.
Hanna just having a fun time, it's in the past, don't even worry about it. Nothing about what he said is at all weird even if you know exactly what happened to him.
Yeah Jesus would never be an inmate, he's the kindest most idealistic person in a shitty awful terrible canon. And Lark was an inmate for ten years, I loved doing his arc and will never make him be an inmate again lol