No, the caption says: L to R: Miles, Tom, Irene, John…
You’re getting warmer there, dude, but you’re still no Encyclopedia Brown.
I used to love those books…but I was too impatient, so I’d go straight to the answer.
Tom Blackwood, because…
He has one glove off for camera adjusting!
We have a winnnnaahhhh…
Sweet! 
So it really was a Sherlock Holmes question:D
Not a guess a famous unicyclist question:p
Impressive UniTyler, well spotted.
Tyler, why are you looking at other men’s clothing? Why does that catch your attention? I’m just jealous because I didn’t spot it. That Blackwood is quite a dapper fellow by the way.
I’m a little late on this thread. In viewing the full size pic and noting the glow reflected in Miles’ glasses, I was going to guess an alien life form. I knew the glow couldn’t be from Harper’s house because he would be a couple miles behind the group photo.
My second guess was going to be the camera timer but I missed the clue. Well done Tyler.
Because I’m a flaming fruity fruit machine, that’s why! Oh baby, look at those fingernails! 
Sigged.
Didn’t Shaun Johanneson have one that read, “I like to dance like a fancy boy” once? That was a funny one, one of my favorites.