Having heard the voicemail I think I can bring some clarity and may have arrived upon a big breakthrough. I believe the 'Bill' mentioned is Bill Davies who owns the BDC Companies, which that name may sound familiar because BDC was contracted to work on the S's garage:
http://www.nate-thayer.com/owner-do...ized-from-jordan-wallace-in-d-c-murder-probe/
This would explain the familiarity that AS expressed and it would make sense that he'd be working on both as he's a general contractor as she would have seen him at the house when he was working on the garage. If indeed BDC was contracted to do both the S home and the studio that could expand the list of suspects as people working for BDC would be seeing the comings and goings of SS plus have personal familiarity with the S home. From what I can tell BDC isn't that big, so probably the ones who work on the garage also work on the studio and they would also know about the driver and the household cleaning staff and possibly surreptitiously gleaned information from JW, NG, etc. while working on the garage. JW could have bragged about the money side of things and NG could have run her mouth off on the security side of things and other such details.
If there was someone from BDC at the studio that Wednesday, they could have been the coordinator as to when to break in as they could have sent a text to Wint et al signaling that JW, NG and SS were at the dojo and that the home would have been as empty as they could hope for and that these three were going to be away from the home for hours so there would be no surprises. Other than for JW (I think JW knew of the studio before NG did based on the AS phone call), I can't think of anyone else who would have the kind of detailed inside information that someone working for BDC at the dojo on Wednesday who also worked at the home and knew of the domestic staff and family there.
If BDC had the contract for both locations and one or more people working on that contract was working both locations, that could explain a lot. Just think how someone with criminal intent would have viewed the house after they saw the big safe in the garage along with the expensive exotic car plus they know the biggest threat is away from the home for hours because they working with SS at the dojo so those involved could get everything on a silver platter without the randomness of not knowing who is going to be inside and who is going arrive...