If Mike really did run a 3:11 marathon then it means on that one day he:
set two half marathon PRs, back-to-back
set four 10K PRs, back-to-back-to-back-to-back
Did so on a warm day, not ideal for fast times.
Did so without being photographed on course despite multiple official race photo spots on course other than the finish line. Finish line photos of Mike, which would exist if Mike did or did not cut the course, showed that his bib was clearly visible and should have been picked up by the photographers. Also, no photos of Mike during the race have been seen in the Lost-and-Found bin, and Mike has not appeared in the background of anyone else's race photos during the marathon.
Did so on a course that just happens to not have any timing maps other than the start/finish.
Did so either without recording it via GPS (which he has done for other runs/race) or choosing not to share his GPS data (which would be crazy if he actually had the data as it would basically clear him)
Statistically speaking, the chances that he did not cheat at this race and there are valid explantations for each of the above issues all occurring together at Mike's once-in-a-lifetime race are slim to none and I think slim may have just left town.