I'm ready to throw my latest theory out there along with everyone else. This is my first time to post a theory, so I really hope I'm staying within TOS. This is ALL IMO, JMO, and MOO:
It's possible that MB discovered something in another trainer's professional life that could have jeopardized his career (IMO, maybe doing side business with CG clients that wasn't sanctioned by CG, or something along those lines). In an effort to keep his career, he turns to his devoted wife, who is equally invested. Having spent years building the lifestyle they now have, and desperate to keep it, they devise a plan to sweep everything under the rug. However, MB had possibly already disclosed her concerns about some of the unethical practices to her family, who were able to provide a good, solid lead to LE. LE is now trying to gather as much evidence as possible in order to piece together the puzzle and link the two players involved in order to get a solid case together before making an arrest.
respectfully snipped by me:
i do not know if this is within TOS, cos i truly hope it is. This or something very similar to this has been my first theory too. or atleast now is