They actually come in the moment the PatioCats have finished their food and happily eat up the remaining kibbles in Mr Zurik's bowl. Or maybe Mr Zurik tells deliberately leaves some behind for them since they all belong to the KGB training camp!
There's Otto enjoying his meal with Vincent right underneath.
Timmy can be restrained from attacking them.
Otto and Igor do go into Bunny's Place sometimes and they get chased by Cleo, Tabs and the rest. So far, they have been able to escape. If I'm home, I will restrain the hunter-females.