Sage became president at the start of her second year. The election would have happened at the end of her first year. That is to say before any of the current members aside from Sage herself and possibly Arieth had gotten into B&R.
You insist that Sage would have found out about the restaurant during her campaign, but you have no basis for this claim. I pointed out to you that Stephen could have ordered the restaurant girls to vote for Sage and persuade others to do the same. If her opponent was involved in the restaurant forcing the issue would have been even easier. How well Sage knew the girls is absolutely meaningless. And even if Stephen didn't rig the election Sage might have simply have been a better choice than her opponent. It is not necessary for her to know her sisters. It's the opposite. She would have gotten their votes by getting them to know her. That's how all elections are won. The voters vote for the candidate they believe will do a better job.
Your insisting that the truth would have gotten out ignores the fact that for at least a year it hasn't gotten out. If it can stay hidden for a whole year it can stay hidden for two. Or three. Or five. Or several decades. All those years predate Quinn getting cocky, which is why the truth is about to get out. And strictly speaking the truth has not gotten out yet. The story might be playable in a way that Sage never finds out. It would be anticlimactic if Sage can never find out no matter what you choose, but it is not impossible that her finding out will depend on player choices.
Its the same thing with the insinuation that the restaurant has been going on for ages and we are just discussing just for discussing. We have no idea how it started or how it came to be other than Quinn was the current manager and stephen being the financial backer. Voting goes both ways especially for school club or student body. You as the nominee, you go out to meet with people and get to know them. This is elections 101, its literally unheard of to have a no name and say everyone get to know me and I won't make the effort to know you.
We are both insisting on the issue, but what I am saying is that if you are saying its been going on since before sage and Quinn became representatives AND sage after ALL these (4) years including the presidency still doesn't know about it and smacks it as a rumor? But it wasn't hidden, it was exposed literally at the start of the game with the scholarship and then confirming it to Maya in the pool in front of Camilla, Mona, Rio.
Lets take a look at another secret that got exposed and Sage got wind of it pretty quick. Chad with Sarah and Mel, she saw that they were sneaking off with Chad and got investigating with the MC in tow. (This example serves how Sage can figure things out if its on the prio list)
Also doesn't help that Quinn isn't exactly subtle at all.