I think the initial investigation was poor, and I'm not a big fan of how the Met conducted themselves in the 80s, but I think they got there in the end with JC.It’s a very plausible (and concise) theory if it is JC. I’m prepared to believe it is him, but I want more proof, and I’m not happy with what LE have offered us in that department.
I would be extremely happy to be proven wrong though.
Unfortunately I think this is one of the least likely cases to ever go live again. The Met as good as declared it as unresolved in 2002 IIRC with the public announcement of JC as prime and only suspect.