I'm curious about the relationship between Tim and Vince. I do find it very odd that a newlywed couple would want a roommate around unless they really did need the money. Particularly if they didn't know him well and when there was a young child who they should have known would need time to adapt to the new family situation. Not saying it's impossible, but just peculiar, IMO.
Now, if Tim and Vince were good friends and Vince was just trying to help out a buddy, he surely would have known about Tim's, uh, extracurricular activities. The majority of Vince's friends interviewed by LE (that were readable anyway) said they really didn't know Tim. That doesn't sound like they were good friends to me.
BTW, the only further digging for another killer appears to have been by folks like us - not LE. Once they had their "confession," they basically shut down. And the investigation they did conduct was lax at best. It will be very interesting to see the evidence they have and the details of the plea deal.
Tim stayed there 3 days a week...most of the, time from what I gather wasn't spent actually in the home.
Your statement about the investigation basically shutting down after the confession is a completely and totally false. The public records that have been released proves it.
What was released was only a small fraction of ALL of the investigation that was going on....and there was plenty, months worth!