While I'm just another Vidal, and the only thing that interests me is Katie (well, also Miru and Zoey, and if they let me add some more, all the better), trying to see the direction that the different LI's will take is always a fun exercise.
Monica has to be the one with the hardest path, and I also see it as more positive that she will be the one with a path ntr more thrown to cheating on her boyfriend, and keeping William a secret forever. I would have a lot of fun watching those interactions in that hypothetical scenario.