I would say it's possible your char crossed his path sometime early in the war (if you're inclined to create an association) when Caezel... didn't do all that well in combat and dropped out quietly. After that he went relatively unknown, though naturally they still could have met (and I have no problem with you improvising interactions somewhere in the course of their histories). I will say it's possible he's heard of, though not actually experienced, some of Caezel's older and less favorable past. I just sent some relative info to Monochromatic if you'd like more specifics on what your char might know on Caezel's past.

If it looks like I'm trying to tie in with characters here, I am - mostly because I feel some history between chars previously determined adds a little spice to IC interactions beyond "hey there oldie... who were you again?".