Crusade should’ve definitely made it to five different seasons, but it was had too much creative tension between JMS amd TNT. Sadly, I did find that that X-Files parody episode was the only sore spot as it just didn’t work, and the humor was two on the nose.

I definitely felt like the show became very X-Files esque especially when exploring some of the different mysteries, but apparently X-Files itself never referenced any of it. The closest you got is one of the writers Vince Gilligan referencing it on his show Breaking Bad.

Yeah I've seen the X-Files in its entirety at least 4 times and I don't remember any B5 references.

Chris Carter and JMS were friends, so there were off hand references to each show.
I can't remember any B-5 references in X-files, but I'd love to be wrong.

I guess you could say that, except the connections between "Visitors.." to X-Files was a lot more clear. And both of the DS9 temporal investigation agents were men.

Actually Sculder and Mully were the Temporal Investigations agents on DS9, investigating the events surrounding Sisco and Company visiting the Old Star Trek episode "The Trouble with Tribbles"
Chris Carter and JMS were friends, so there were off hand references to each show. One was that poor teddy bear that Sheridan "Spaced" at the end of one episode.

I called them Sculder and Mully.