Hrm... in Yu's speedrun of the NijiGaku anime, she had six idols in her party, including the required Student Council President, by the end of episode 3. Is leveraging a previously dissolved party considered a hack? Or the boost she got from guest PC Karin until she officially joined the party, hitting the then-current nine idol cap, in episode 5? Comparing across games probably isn't fair, though.
(Very cute bit, this story.)