This detail is what gives away the cheating IMO. He didn't take any selfies this time so that no one could ID him in miscellaneous pictures.
printer wrote:
Mike is such a narcissist that he would have posted a picture of himself at the race if he was going to run. Instead, he posted pictures of other runners near the starting line before the race and slow finishers at the end of the race. I seriously doubt that was dressed as a runner and ran the race.