The police have not confirmed that Corrie couldn't have left the area undetected as you well know, so no links will be forthcoming. Much of the information we have is sole sourced from the family and is unconfirmed by the police. However, in doing the recent search of the properties opposite the horseshoe is a tacit confirmation IMO, given TW's logic as to why they should be searched. Also the police hinted in that direction:
http://www.heraldscotland.com/news/...r_missing_Scots_RAF_gunner/?commentSort=score
In addition, the fact that all routes out were covered by CCTV has been reported by the MSM, eg
http://www.bbc.co.uk/news/uk-england-suffolk-38267086 without any contradiction or correction from the Suffolk police. None of this is confirmation in its own right of course.
But to turn it on its head, why don't you say which route you think he could have left the area by, then we can see whether it's credible.