>It is a threat to his relationship with Kim however

Kim already knows. She was pissed at Jimmy after the first convo with Chuck (after she gave Chuck the whole "I feel so for you" speech). And she basically told Jimmy to go back and make sure he covered his tracks at the copy place.

I guess he could threaten to play the tape to Mesa Verde, but what the hell would they realistically even do if he did? He doesn't have a lot of credibility with them anymore. Kim could/would reveal Chuck's mental issues. They'd realize there's a lot deeper shit going here beyond Kim.