Their story really only makes sense if you believe Trump is insane. Which… Sells to the public, but doesn't hold up as internally consistent.
Now you have this guy saying "well, I thought the wire was for something else…"
Their whole assault on RR, now, is pointless because Mueller's investigation is over. They wanted to gain control over Mueller and to be able to have control over leaks. Now they are just going through the motions and trying to dodge perjury as a consequence.
Or - perhaps there really was a discussion of it in the terms of "well, if you guys want to do that, you need this, that, and the other. What. You want me to wear a wire?"
Which is probably somewhat close to the truth, but also rather irrelevant in the grand scheme of things.