the MiB is related to the partner that died, brother? Son?
I'm 99% sure there are no present day / flashbacks with MiB's storyline and those other two jokers, when he lit the match the woman in the control center asked the security guy about authorising a pyrotechnic, they were also in the room when they were talking about Deloris going off script and ending up with the "jokers", I know you could say it's slight of hand and two coincidental events, but I question whether that's too much of a plot twist for the viewer? Are HBO known for these kind of tricks? I don't watch any of their other series.
I do think the little chats the black guy has with Deloris we see in the beginning each episode are set after the events in the episode though, they make more sense if you watch them again after.