We had a case in Queens many years ago that was as big as this, if not bigger. Had two suspects off the bat. One was of inferior intellect. He looked like this guy in this case. He confessed to the murder of the young girl. Our boss said, no good - we need more. The guy simply wasn't believable because of his IQ. I can tell you ALL of us believed he did the deed so it wasn't a matter of disagreeing with others.
While doing that case we stumbled upon a case where a lady senior was murdered in her bed. Stumbled on the killer in that case.
The so called confession in this case doesn't mean that much to me. Better to have it then not have it. But with people like Lewis it is always a problem.