It's a theory that I can easily see. Voyager is a very small ship for the exalted rank of full captain. I could see Janeway, with her background, as an officer being fast tracked to the admiralty. Voyager was a place to give her some ship time and a mission which was perhaps relatively easy. It would have made a great contrast with Chakotay, someone who'd commanded ships for real for some time at odds with a captain who was a rear echelon paper pusher. I guess they backed away from that or didn't see it that way, but it would have been a great conflict generator.