I think one of the reasons LE is pushing hard on W1 is this:
W1 texted a photo of half the money at approximately 9 am. He texted SS 10 minutes before arriving at the house, which is after 9 am? I don't know what time he picked up the money in Hyattsville, but I think it would take about half an hour to drive from the bank or AIW to the S home. ASSUMING he texted his girlfriend before SS, he would arrive no earlier than 9:15 am.
VF's husband arrives at the S home at approximately 9:30 am. He sees two cars on the street, one of which is the Porsche. Who does the other car belong to? Could it belong to W1? The Audi and the Range Rover were parked side by side in the driveway. The Porsche was not in the driveway, but on the street. I don't think when Mr. F said he saw two cars, one of which was a Porsche, he meant three cars. If so, that puts W1 at the house at the same time as Mr. F, but in the time it takes Mr. F. to bang on the door, go around to the back and receive a phone call from SS, he doesn't see W1. If all W1 is doing is putting an envelope in the car, it shouldn't take more than a minute, especially since we now know the door was unlocked - so no hunting for a key.
Also, does Mr. F know what SS' voice sounds like? How do we know SS spoke to Mr. F?
The night before, SS leaves a voice mail on NG's phone, asking her to call anyone who might be worried about VF, because she will be staying the night and her phone is dead. Which raises the question - why didn't VF call her husband on the house phone or SS' phone? It's been posited that SS didn't have Mr. F's phone number or Mr. F didn't speak English well enough, but that can't be true since SS' phone is used to call Mr. F the next morning when Mr. F is at the S home.