It appears that Insights is automatically creating link sets. But as I was figuring that out, I got it totally confused.
- click to open passage guide (link set A)
- click to open Pauline parallels resource (link set A)
- remove link set A from bible and passage guide
- close Pauline parallels
- click to reopen passage guide (link set

- click to open Pauline parallels BUG: still "linked" to A which has no pair