Although it is not a likely thing, imo. when dealing with a freaky and very nasty perp. anything is possible and perhaps his DNA should be compared to any and all especially bizzare cases.
Ears was not known to attack very young children, although some of his victims were underage.
JBR was just a little girl, but because she was " presented " as an older female, a perp could have been angered/triggered by that and responded accordingly. But if it was EAR , he would have definitely gone after the parents.imo, speculation.