There was a time, not to long ago, that you could make a very compelling argument that Tony Stewart was the best driver in the garage area. he's a two time champions, but more importantly he seems to be able to drive any kinda of car on any kind of track.
That being said, there were actually many people who thought he would never be able to make this owner driver thing work. And while he's proved he can compete as an owner driver, winning a championship is a whole nother issue. While Stewart Haas racing has the advantage of having Hendrick Motorsports support, remind yourself that this is still a very young race team.
Smoke is a champion, he's a winner. There's no reason why this team cant compete for titles, and if he won, no one would be surprised. But they are likely still a year or two off.