I just finished writing the article on Megaman Battle Network 5 for The Cutting Room Floor. Check it out!
I think it's fairly thorough and mentions that Wireless play feature. I've seen how they write articles on this website, though and I think it needs more comparisons. Primarily version-differences and beta screenshots. This also means I can move on to the BN6 article. Obviously I have tons of content for that.
Speaking of beta, I found something interesting while digging through old Capcom websites. Not only did Dr. Hikari's mugshot in BN1 used to look hideous, Max Mode is actually used. I haven't played the game recently, or any multiplayer, so I didn't know. Apparently Max Mode shows up during multiplayer. I didn't know. But it had to have something to do with multiplayer since BN5 brought it back exclusively for Crossover Battle.