Chapter 22- "Our Doubts Are Traitors" part 2

[Jeebogs]

Not if they put a trap well planned, they could concoct a story leaving gaps that could be filled by the guilty part triyng to pin the crime to Lewis...

Like I said, all the shooter has to do is sit their hands and hey presto.

...or leave some hint that if he's not the murderer he should be in a position to know, and wait for the shooter to pull a "Jack Ruby".

I can't see this would work, the whole idea of 'convicting' Lewis is to prevent panic. If they go and say, "we've got this guy, and we think it's him, but if it's not, he might know who it is....."
Kind of counter productive. They need everyone to believe Lewis did it so a panic doesn't start.