I think I can be objective with people to whom I am not connected. Full disclosure, in my past I know what it is like to have had an affair and the craziness behind the scenes, almost like living a double life. I used to travel extensively in my work and had a great deal of independence. BC only travels locally or semi regionally but she still must have had a good deal of independent time away from home. Then the surgery and all comes to a halt even for a few weeks. Also as she may have had more than one affair going on, it's possible she was sometimes indiscriminate, or became involved with someone who was more controlling, someone who was really jealous of MC because he felt that he held all the cards, after all when she had to rest and recuperate she did it there, with him. Or maybe she had truly fallen in love with this other man, an emotional attachment is always a chance you take when you play that game. Perhaps he realized she was right back at home with MC and decided to quit seeing her and she panicked because she couldn't stand losing him. I myself have been in a marriage where I didn't feel loved, (even though later I realized I really was) and I looked for it in the wrong way.
As I said I can be objective with people I don't know but if I had to investigate the people with whom I have had bible study for several years, I might believe their testimony and be looking elsewhere.
I wonder if the rumors are true that one of her affairs was with a sheriff's deputy. An intentional cover up that SM is unaware has occurred to me. For sure that should be easily exposed by the PI. And I think these recent statements, the slow bike ride, first 2.5 then when that clearly is unbelievable it's 4.5 mph, which is still wrong on a bike, is all SO very ludicrous I wonder if it was a staged comment. An interview on a FB page. Releasing no missing bike description, no request for citizens to help locate a key piece of evidence. Maybe the PI has already uncovered some collusion by the deputy investigating and this is a way to giving him or co-conspirators the message that they are closing in. Granted the sheriff didn't come off that way. But it was so over the top stupid that I think there might more to it than we realize.