I think the main mistake of the last tour was making it so intense, that probably exhausted him too much and made him think "I'm too old for this",
My impression was they knew it was going to be the last proper tour before it even started. It was longer and more comprehensive BECAUSE it was going to be the last tour.
I would guess that performing MFN again was the gift he made to the audience anticipating that it will be the last chance to hear him.
Of course this is only my opinion no proof.
Another reason could be he was simply in the mood to perform it, was searching for a golden hit to replace the absence of both SOS and TR.
I still wonder how an artist decide of a setlist and the order of it.
I mean they are concious of high and low times of the show toward the audience and that is somewhat artisticly managed.
I would say that the 2005 tour had featured the strongest final part of the main show, the triplet
Boom, Like That - Speedway at Nazareth - Telegraph Road sending the gig to it paroxismical point.