I guess that was Mark's own decision for the sake of perfecting the things as much as possible.
Take a listen to The Straits' version of Your Latest Trick — Chris White goes all other the place, not only on stage, but even playing-wise. It gives me the feeling like he just has been released from the cage or something. In DS days he was just standing there playing nice saxophone, and here what? What's up with all these accents and stuff? Why to dance around the guitar player? Imagine that at any DS gig!