Was it overconfidence?
Was there overconfidence in Sarah Sessom's ability to cloak her home as a sort of shield to hide Bella from her pursuers? Was it a matter of underestimating The Arm's – and thus Dominic Black's – ability to use new technology to see THROUGH the disguise? And did it even matter now…?
Keith knew there was no way it could happen forever and that eventually that cloak would not be there, so he didn't really know what the hell the plan was. Had he been hoping The Arm would just get tired of the search and give up? Had he thought they would literally roll into town and start going door-to-door with armed soldiers resulting in a sort of Waco, Texas shoot-out between their agents and local law enforcement?