Jannick's biggest contribution is his attutude, personality, and chemistry. He had a huge impact on the band's dynamic when he joined, when the band clearly needed some "loosening up". I believe he's vitally important to the bend, even today. Could they get by without him, sure, but Steve not only kept him, but he's maintained his "side" of the stage where Adrian used to roam. I think the band, and Steve, really "get" what Jannick brings. He also showed great chemistry on with Bruce on the Tatooed Millionaire tour.