I didn’t watch Shania’s band as closely, but I thought they couldn’t be using the lame excuse for lip-sinking that it’s too hard sing and dance at the same time. On the other hand, they looked too air guitar showy to really be playing. I gave them the benefit of the doubt when I saw the monitors on the stage. But the monitors were probably just waiting for No Doubt to use.
As for Sting, it was semi-inspired to have him do a reggae-inflected Police number backed by No Doubt even if Adrian Young is no Stewart Copeland. Unlike Elvis Costello and Joe Strummer until his untimely demise, Sting is now too stodgy too play his old songs. He looked like he didn’t want to move, lest he risk wrinkling his designer pants and artfully slashed t-shirt. Maybe he’ll be willing to cut loose and look less establishment/dignified at the Rock and Roll Hall of Fame induction reunion with his old band.