He may or may not have known....he may have got information from an employee who thought his motive was only burglary. His motive may have been burglary initially then he had a change of mind
But my theory doesn't require anything convoluted. We know for a fact my suspects observed the entire Mc family on the Sun and Thu at 5a.
The CB dunnit theory is implausible imo eg went on the rob but the first property he arrived at just happened to be unsecured, so no forced entry required, and then seeing a sleeping child home alone he decided to forego any valuables and take MM instead.
There's no evidence the staff at OC were criminally minded tipping of the likes of CB. If they were don't you think they would grass him up or discuss with others who in turn would do the grassing up?
Most have some sort of moral compass even burglars and such like. Giving someone the green light to rob a holiday apartment is one thing quite another if it involved child abduction.