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angus talks about Mal
http://loudwire.com/acdc-angus-young-malcolm-youngs-dementia-symptoms-during-black-ice-cycle/?fb01
Considering what has been revealed by Angus, it might explain the lack of flexibility that the Black Ice tour setlist had unlike the setlists for the previous tours. Perhaps AC/DC played the same songs every night because that's all that Malcolm could handle. The Stiff Upper Lip and Ballbreaker tours were a lot more flexible, but that flexibility can't be used when one of the band members can barely handle the songs they are playing on a regular basis. Suddenly puts a new light on the previous tour and album.
Yeah, now I feel like a douchebag for giving the band such a hard time about the McSetList. It really explains it, along with why the band fucked up Back in Black somewhere on the BI tour.
I guess now that we know the full story, they have Stevie playing Mal's parts, and it's probably the last tour, there's a possibility of a more flexible setlist...