I brought this up in the TNG section talking about Shelby. Because of the Borg attack and 40 ships destroyed at Wolf 359. Starfleet created a task force to fast track the building of at least 40 (or more) ships to replace the ships that were lost. They also had to do some mass promoting to get new captains and commanders for those ships. Given that Voyager is a new ship, about 3 to 4 years after TNG:BOBW, I would assume that Voyager was one of the new 'replacement' ships and Janeway was fast tracked to Captain. So there for, no Wolf 359 attack, no Voyager, and Janeway would be a commander (or LT CMDR) on another ship somewhere? I would love to seen an episode were some how ( some time technobabble ) Voyager stops the Borg from invading the Federation (in BOBW) and thus radically changes the time line. Instead of Voyager chasing the Marquis in Caretaker it may have been another more older ship that was originally destroyed in wolf 359. Maybe Janeway is a commander on the ship by pure coincidence, and she somehow realizes the timeline is wrong, as the ship is stuck in the Delta quadrant . Would make for an interesting episode.