Look for him at the start. He'll look like a spectator.
He will be the only one with his number not showing, until the finish line.
He will mysteriously miss several check points.
He will be seen walking in photos with long pants on, where splits show a 6:11 mile.
He will somehow discard all of the clothes shown in the photo, with no witnesses mind you, and end up finishing with a different hat (we all change those during our marathons), different shoes, and suddenly decides to show his number.
He will be asked to explain, but won't and will threaten to call the police if you don't leave...unless you are a paying dental customer.
He will then claim innocence saying that there is a perfectly good explanation for all of the confusion.
So yes, he should be there and look for him to come in closely after Meb and Hall, but you won't know that he's there until the finish line, almost like he's invisible.