You can listed to the Allied Forces clip, like five songs into the set, and it's far more like the Gil we remember. And I believe that's a more challenging song for him to sing and play. As well as for the band to play.
I know it's tradition for Gil to open the show and Rik to end it, but I think they should have considered having Rik do the first song, just to give Gil a chance to ease into being back on stage. You can listen to AF and RMW and it's plain he can still deliver the goods!