I don't want to believe W1 is involved. I'm still thinking about that photo sent to his GF. I'm thinking this points more to his innocence than to his involvement in the crime. While I don't know anything about GF, most girlfriends don't want a boyfriend who is involved with crime. The photo of the cash might have been sent to impress her, but I don't think a big heist would impress a girlfriend. And I REALLY don't think the girlfriend would be impressed with kidnapping, torture, and murder.
We don't know how LE found the GF.
The other question about W1 is WHY WHY WHY lie to the police? And what's the big deal about the locked vs. unlocked car? I don't get it the significance and why he would lie about it.
At this point, my guess is that Wint and one other person were in the house and that no one else was involved, but others in Wint's circle perhaps knew about it.
I don't see Wint as someone W1 would be remotely interested in.
JMO, total speculation, completely open to changing my mind later.