>>Occam's razor would make me suspicious of coworkers able to guess/find out his pwds -
>>and in such a scenario Michels more direct probings are automatically firewalled.

Even if that's a risk in some working environments, seems to me that it would be just as likely to backfire if they shared locations for the months of Grover's membership. it's also remarkable to maintain a double-deception for so long without any crossover. And surely there are easier/more dramatic opportunities for somebody so close if they want to be malicious.

I agree that Occam's Razor applies. The problem now is that the "Profumo would say that" principle is in full effect and we can't expect Michel to be moved at all unless we can come up with a realistic explanation. I'm as committed to fairness as the next person but I'd want a realistic proposition before approaching Michel to contradict his 15 pages of evidence.