I'm pretty sure the man in black in Couch is not Bill Shelley but Danny Arce!

Alan,
That looks like a great call, as the determined heights of Shelley and Arce will show.
Using my 3D model I measured the apparent heights for Arce, Williams, Det Brown and Shelley against a perp-like-walk photo, with Lovelady popping in next to Shelley for the group photo (I don't know the photographer).

Results for their heights are as follows:
Arce 5'11?
Williams 6' 2.5?
Det Brown 5' 9?
Lovelady 5' 8.5? (from other sources)
Shelley 5'6?
The next exhibit compares the alleged Shelly against Arce, as seen a Mal Couch frame. To make these renderings I had to assume a curb height of 9?. I also added a Lovelady stand-in, who's height does fit nicely with the alleged Lovelady. The two men in Couch could include Billy Lovelady, but not Bill Shelley. Danny Arce is a good fit as the taller man.
