Controller could hide as just another wallet with a balance. Remember they have 3 months before they have to pay out... controllers could theoretically do nothing till then right? I don't have knowledge of POS coins in action so not sure if there are daily transactions and workings you can watch out for as signs.
No, actually Prime Controllers are supposed to provide the consensus for the instant transactions. That's a very important feature, probably THE most important Paycoin feature. So it's either going to work in about 7 hours from now or we have another red flag.