First off, well done for finding that photo.
This is my humble opinion.
1) He is one of how many runners wearing long sweat pants?
2) His pants are off at the finish line. So he stopped at some point AFTER 30k and took his pants off and then resumed 6:35 pace? Who does that?
3) His shirt is not the same. Who wears a shirt over another shirt in a marathon and doesn't take it off well before 30k in weather like that? Look at the runners around him.
4) You are talking about 18.6 miles into a marathon and running 6:35 pace and still running in sweat pants. He was not running 6:35 pace at that point.
5) Look at the runners around him. He is NOT running anywhere near 6:35 pace at that point and is being passed over and over. He is shuffling on the shoulder, blending in so runners in the middle don't mistake him for a real runner and remember him.
6) When you run next to the curb, it's easy to act like you are running with someone for encouragement and then bail.
7) Re-enter the same way. Acting like you are waiting for someone and then taking off like you are giving them encouragement. New crowd sees you 200 yards later and you are a runner again.
8) If he could really run that pace, think about this. Why would he not prominently display his race number and want to be seen?
9) I know what the splits show, but it's smoke and mirrors people, that's all it is.
10) His shirt is not tucked over his number, his pants are pulled up over his number.
11) Accomplice or not, car or not, he did not run 2:52 on that day. He looks beat with just less than 8 miles to go.
12) The only other runner not wearing a number, well ahead of runners who obviously would have started in front of him is this guy. Probably means nothing and could be a spectator, but...... If someone else already posted a picture of him, you have my apologies. Look at the gait of the runners around him and look at his. Another phoney.
13) Con, total con. Cannot be legit looking at the guy at 30k, no way. I bet at that point he's running 8 minute pace if not slower.
14) Why is he wearing black? Because the number would probably show through and he would be discovered.
http://jimrhoades.com/10/boston/30k/index.html