OR...he choose petite girls because he, at the time, was disabled in some way, and he might have told the girls this in order to put them totally off guard?
FYI... my POI was, according to himself, heavily disabled in the timeframe where the GB4 victims was murdered.
However I have found evidence/prof that he, no doubt, has been lying about this claimed disability, at least he has greatly exaggerated the degree to which he was handicapped in that timeframe, and for, at least, a couple of years, you have not been able to notice any kind of disability on his part.
This POI has been lying about a LOT of things by the way, he is my POI for the AC4 murders as well.