Coming late to this issue, but I think police most likely identified this person through the real estate lock box code they would have had to use in order to open the front door.
Edited to add, or the person simply came forward to police as soon as the bodies were discovered.
It could have been HS's personal trainer come to do a training session, not sure why propose an affair. Who ever it was wouldn't wait in the home, but call out and text, then wait in the car in case she had slept late or was in the bathroom showering, etc. Just being respectful.
If the mystery man is not a suspect, his entry into the home does raise questions.
If he was the trainer, how’d he get in?
If he was a realtor, how did it come to be he had the lockbox code as he wasn’t the listing realtor?
Or was the front door left open? But then what, this visitor wasn’t alarmed, instead just left even though both Barry and Honeys vehicles were parked at the home?
Did he attempt to contact either of the two by cellphone? No answer, or was a cellphone taken by the perp for purposes of impersonation to delay discovery of the crime?
Why did this person park on the street instead of pulling into the driveway?
Three times in and out for a total of 29 minutes, what was he doing? Even though it’s a large house, 29 minutes is a long time to spend in a house with nobody home. If he was looking for one of the two, why didn’t he notice the bodies through the glass door into the poolroom/garage?
Whoever this person was, Saunders never said he had no involvement in the double homicide. IMO considering all, there’s a greater chance he did than didn’t.
Otherwise the circumstances regarding this mystery visit had to have revealed additional information that is helpful to the investigation. Thus my theory, it’s been leaked for a purpose, to yank the perps chains.