1. That in her world (Football Sensei), she is the only one who even knows about the Resets. Her Sensei doesn't and it seems like her Ami probably doesn't either (or at least this Maya implies that), and it seems like none of the previous Senseis had figured it out in this world either.
2. There's also how Himawari was involved in our Sensei buying the Scarf that he gives to our Maya Prime, who seemed to not have had that Scarf:
Assuming that the Alt Maya Prime could be our Maya Prime in the past, she may have gave our Ayane her Scarf, which ended up in our Timeline, then perhaps this Scarf will end up going from our Ayane to Himawari who then ends up in the past, selling it to either our Sensei, or the next Sensei, in this paradoxical cycle.
That Scarf could have created a paradox. I mean, whatever even started this hypothetical time traveling stuff (Nao-chan?) created it, but the Scarf itself seems important to it. (Of course, this same Scarf seemed to show up later with Chika in Chapter 3, but I'm not entirely sure on the importance of that).
3. I wouldn't really put it past some of these girls to drug rape Sensei, tbh. I would expect some to be okay with it, while others wouldn't, though, in game, and probably IRL. Realistically, Morality varies from person to person, and usually from context to context.