hmm i see the darkness stuff as an atypical possession of the spirit that might result from depression, tragedy, wrath, all those deadly sins, etc., so if being a criminal is just kind of who chuuya is, then nah it's not a darkness thing haha. but yeah yato and chuuya would see each other enough that chuuya would have no problem remembering him!

upon further thought, yato will probably still be able to function decently as a bartender because like in the example pages linked above, most people already think of workers as background characters... so when they want to see him as a worker, they'll be able to see him as a worker. he'll just have to try a little harder to get customers' attention when he wants it i guess!! chuuya letting him do other stuff or assisting with orders would probably be smoother though, so it can be up to chuuya's discretion where he wants yato to work =u=b