Looking back, I think it's very hard though to argue that Kobe was the undisputed best player in the league during those years. Even if he was, his superiority was not much larger than that of his followers like LeBron's clearly is right now.
Let's not forget that LBJ was the back-to-back MVP in 2009-10 and no one would dispute that he didn't earn them. Kobe's 2008 trophy on the other hand was much more contested, and his 2006 season was probably better anyway. And while I know that I will seem a big homer here, but in terms of offensive efficiency you could pick any of those seasons and argue that Dirk was probably better at that point. The Mavs had an awful team for around two years as they went through a rebuild that added Marion, Butler, Hayward and ultimately Chandler so Dirk was pretty much in an island. But individually I have never seen Dirk play better than the 2009 playoffs, including 2006 and 2011. But no one remembers that year because of the team around him.