If you don't mind, I am going to take what you said about CT and insert MB's name.
MB and BB were have been together a long time. They have 3 children and are doing what everyone else does, working and raising a family. MB has been around a lot of men as part of her career choice and likely men flirt with her. But, that doesn't mean she responds to the flirtations or jumps into bed with these flirty men. It is pretty much an assassination of her character to believe that she has no regard for her husband, her children, the family she created, the life she made for herself and would risk everything for some meaningless sex with a married man.
Despite how long people have been married, some people make the choice to seek relationship(s) outside of their marriage. Kids don't make people immune to wandering eyes, thoughts, and actions. I have no idea what the nature of the relationship was between AJ and MB, but LE felt the need to gather AT/CT's trash and subpoena all of their electronic communication for approximately 45 days. I cannot fathom LE doing that simply because AT and MB were in contact with one another. Do you think that LE was taking the trash and subpoenaing the electronic communication of every camper that MB came in contact with at her Austin event? Even if AT was on the SW simply because he exchanged calls with MB, that wouldn't explain the inclusion of CT. Why would she have been on the SW?
I don't agree that the SW includes people simply because they came into contact with MB in her final days. If that were the case, the "Target Number" list would have included 100+ people. However, the "Target Number" list is very small and pointed IMO.