You're right on, Leadfingers! He's "da man"!
Notice how the Pipe Major wanders around the circle to play alongside the other pipers. He's checking the standard of playing in the very last moments before the band plays before the judges.
At one point he pats one on the back and that piper is seen to leave the circle. That's a sign that the piper is being directed to sit out for the imminent competition (a devastating feeling, believe me).
Nevertheless, this is how good bands become great bands... and this is one of the latter.