There was a reason I did this open interrogation of sorts in front of everybody else right as I announced the lockdown, and it was to cause chaos in their psyche so that they wouldn't be able to think of proper excuses or match their stories because of the very small timeframe I gave them. Sure, seating them one by one would work as well but there were very few times that this tactic could work and be tried, and this was the perfect time to make them fight amongst each other.
It'll only need one whistleblower for everybody else to start digging up dirt and airing everyone else's dirty laundry besides themselves, but in the end, I'd just have more information to work with. Furthermore, Kaley wouldn't need to rely on her insight as much because people would almost always tell the truth when emotions were heightened and if their life and their families' were on the line.