You could argue that awol only fits with what we know of the character and family relationship with Corrie. Let's be honest, none of us know him. None of his friends or colleagues have come forward with personal information. I understand especially from the military perspective it's not something you want to tar anyone with, so I think while I agree with you he's unlikely awol, it can't ever be completely eliminated until we have some evidence of foul play.
As for the phone, let's think a minute. Why would a phone go in a recycling bin (full of cardboard and paper presumably)?
If you're minimising your chances of getting caught causing harm to someone would you scatter the evidence doubling your chances of being caught? The pings aren't overly accurate, just because they show it could have been in the bin lorry it equally could have travelled close to Barton mills in any of the may other roads in that direction. It may have not been gone to Barton mills it only has to ping the mast.
I'm thinking he had his phone and the battery went dead. I've never had a phone battery last all day until 5am!
Lack of evidence doesn't support a struggle theory. You have to think he must have had a plan for the night, he wasn't going to sleep in the city all night (Nicola confirmed he didn't mean to fall asleep and he didn't sleep long) so he's either planning to meet someone or planning to walk home. How would meeting someone and waiting two hours benefit him more than getting a taxi home?
If you believe he met someone you have a few options
1) someone he knows that he verbally arranged the lift with
2) someone he knows he arrange the lift with over the phone
3) someone he doesn't know he arranged a meeting with through an app
Which one benefits him sitting outside early hours of the morning in the cold instead of getting a taxi home?
What it comes down to is this, you can't enter or exit that loading bay unseen. You just can't. So if you see Corrie enter, you see Corrie exit. Tony has explained how they indemnify people by gait , measurements of sizes etc so we can assume none of the unidentified are Corrie. To get Corrie out "unseen" would require a vehicle. We have vehicles on cctv so it has to be one of them. The unidentified are most likely witnesses, if you can get a witness to corroborate Corrie getting into a car that's vital evidence.
For anyone unsure about the area shown on cctv the find Corrie website has a video someone has taken that walk from the takeaway down to the doorway he sat in and then to the loading bay.