I don't like people who always start from the top it leaves no room for expansion and they only get stronger if they do. Likewise starting at the school under Nero is pointless since what is there to do? If they know we're spies then why are are not in a prison since we hit Kyushu? They could not know the plan and just progressively work up like any other student but what's their end goal other than to get better and what happens when they conflict with us? We ARE the infection per say we're not the loyalist heroes. Likewise what's the point at starting above one star? At that point we're already in Nero's graces as we're captains of specific clubs or amazing students. Or he doesn't trust us at all and he always has an eye on us leaving us little room to maneuver.