Okay I lied, apparently:

Exhibit A: - it’s so obvious now how fake this transporter clone of him looks here!?

Exhibit B: Have you ever noticed how you never see Janeway and O’Brien together in the same room at the same time? Continuing with the Clark Kent and Superman analogy, it might be possible to capture the change from one to another and OMG there it is!?!?

Exhibit C: - c’mon, don’t tell me that you don’t see it, “cunning”, “miracle worker” - seriously, how did he evade detection for so long already, sheesh!? 🙄 How else could a mere captain come up with a plan to replicate infinite photon torpedoes!? That is the work of an engineer! (The whole coffee schtick was a lie, covering up the raw materials stolen from the nebulas for… “other purposes”.)

Exhibit D: Miles O’Brien is so bored (“how bored is he?” “shush, I was just getting to that, if you’ll let me speak!” “soooorrrrryyyy your majesty” “don’t worry about it, I pardon you, omg is this thing still on?”), he’s so bored that he decided to leave the Alpha quadrant and take his adventures elsewhere. The Caretaker was just a fiction - another transporter clone to justify and help sell the whole scenario. After all, we wouldn’t want anyone thinking that it was Janeway who wanted to be in the Delta quadrant, now would we? WOULD WE!?..

Edit: Darth Jar Jar has nothing on the genius mastermind behind Miles O’Brien, Janeway, and whatever other identities this Doctor-Who like being has held over the years. He who controls the transmission of matter into energy and vice versa is like unto the gods themselves. Rank bars, gender swaps, nothing is beyond his reach (except you know, the love of Keiko).