You might disagree with me on this, but I think that this being demented verse, it would almost have to be au.
Think about it this way, leaving aside whether Sam knew Dean was still alive or not, or if he was in shock or whether he bothered to look for Dean or not... the fact is that he believed himself alone and had limited resources.
In the demented verse though, that is not the case. The moment Harry finds out that Dean is either dead or missing, he'd come look him up and help out. With Harry's help, they'd probably at the very least try and find out if Dean is alive or not, which would make a huge difference in Dean's reaction when he returns.
You could still take the parts of canon that you did like, but alter them keeping those changes in mind, while getting rid of the whole 'Sam didn't even bother to look for Dean' bit because Harry'd be there.
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Think about it this way, leaving aside whether Sam knew Dean was still alive or not, or if he was in shock or whether he bothered to look for Dean or not... the fact is that he believed himself alone and had limited resources.
In the demented verse though, that is not the case. The moment Harry finds out that Dean is either dead or missing, he'd come look him up and help out.
With Harry's help, they'd probably at the very least try and find out if Dean is alive or not, which would make a huge difference in Dean's reaction when he returns.
You could still take the parts of canon that you did like, but alter them keeping those changes in mind, while getting rid of the whole 'Sam didn't even bother to look for Dean' bit because Harry'd be there.