Good point. I'll start a list.
Suspect must:
1. have familiarity with and not stick out in AJ's neighborhood.
2. have familiarity with Southampton house location and/or route through area to NC
3. know AJ was home that week.
Suspect may:
1. work with WH.
2. have access to blue/black van.
And may drive a white compact car and participated in searches and may be a relative of WH??.