You're not the Janitor, if you don't call the title! Mwa ha ha! It's one thing to clean here or there and another to be an actual full-fledged Janitor (with a capital J no less).
Also, N_B is the Succeeding Janitor. Saying that one janitored before someone that wasn't the first of the rest doesn't say a lot, so "even" doesn't work in that sentence. It works later, though.