I feel bad for senpai, she is much better choice, she is kind, open and genuine person. But by the rules of genre she has already lost. We could delusion ourselves with another outcome, but FMC ending is a cannon event. To bad so many mangakas dont feel the flow of the story and get stuck with there first choice.
I really hope it continues that way and for them to actually try and make the throuple work in a semi-realistic way, even if it falls apart before the end.