I'm not sure where this post is going as I start it, but going to write it in the hope of sparking discussion.
I'm going to make some assumptions of things to eliminate. (Sherlock Holmes' Procedure)
Assumption: there was enough CCTV footage that if Corrie had walked out of the horseshoe 'one' of the cameras would have picked him up, and that would have been viewed by now. This means Corrie didn't try to walk home from that location.
Assumption: there were only three vehicles plus the bin lorry in the vicinity in the timeframe of interest. This wasn't a random pickup nor an unwilling pickup. But Corrie could have traveled out in a vehicle.
Assumption: Corrie didn't end up in one of those bins. If there's a dead body in a bin, then it'll be noticed on emptying the bin lorry at the other end. If there's a body in an enclosed bin for 2 days or so, then someone's going to lift the lid on the bin and either see a hand or foot sticking out or they'll smell something.
Assumption: Corrie didn't enter one of the horseshoe buildings. The stairs have been checked for forensics, and everything else is too high to climb over.
If we rule out all of these, not because we're certain but just in the way you do mathematical assumptions, then what is left and where would those left over options take Corrie? How would one of those options lead to Corrie's disappearance and lack of forensics/evidence to show where he went and where he's been for the past 9 weeks?