I've read the thread and find the whole thing so tragic that he was seen then vanished into thin air almost within 15 minutes. I would think that if he was hit, that the snow would have been disturbed or some type of evidence would have been seen in that short time period.
It makes me wonder if he didn't voluntarily take a ride from someone. It'd be nice to know if the officer dispatched saw any other vehicles or if anyone else driving in the area did that night.
I tried to look through the facebook page but found it a bit confusing. I did find this poster saved as a file there and it's twin on the Tupper Lake homepage:
http://tupper-lake.com/10000-reward-for-location-andor-safe-return-of-colin-gillis/
It states that he had his jacket on (the one we've seen stated that was in his backpack). I haven't seen anywhere else say he had it on from eye witness testimony but perhaps they just assumed he'd have put it on (or someone at the party reported him taking his backpack that had the coat in it). If his backpack had been left in a friend's car or at the party you'd think the police would know that and it'd have been taken for evidence or returned to his parents.
I found this news article that I don't believe has been linked here:
http://www.pressrepublican.com/0100_news/x254598196/Colin-Gillis-missing-for-one-year
It describes the search in more detail than we've known. It looks like they really did a thorough job as far as searching the bodies of water:
Teams worked an intensive grid, walking step by step, covering miles of backwoods terrain as rangers and police used air boats and high-tech radar equipment to peer into the waters of the Raquette River and Piercefield Flow.
It seems rather unusual for a stranger to spot him so close to when he disappeared yet no clues are really available. It makes me wonder if he voluntarily left with either a stranger or a friend and then something happened from there. I wish there was more information about what happened at that party!
This article states this about what was found:
http://www.wcax.com/story/21568766/investigators
But a year later, just a few small personal items have been found, including his ID card -- located in the road the day after his disappearance.
That doesn't really sound like his shoe though we know that's been discussed as being present then pulled. What if the shoe is a red herring and never happened? What if he lost his id awhile back because he fell for some reason related to exhaustion or the slick snow? It's never been stated how close to where he was seen where his id was found which seems like a really important piece of information!