I think that they were playing with the idea of B'Elanna/Harry and B'Elanna/Chakotay early on. But then, Chakotay and Janeway showed such amazing chemistry, while they were planning on doing away with Harry.Caretaker, along with certain scenes in Season 1, definitely made inrodes to establishing a foundation of sorts for their relationship. At minimum, an episode like The Chute or Blood Fever (or even potentially combining the two into one episode) would have been interesting.