You're not wrong. But a lot of people seem to think KDB was average before he went to wolfsburg, he wasn't. Kev won the title with Genk when he was only 18-19. With Genk he had 6 goals and 17 assists in 10/11, 8 goals and 15 assists in 11/12. Was lent to Werder Bremen in 12/13 who were fighting not to get relegated: 10 goals and 10 assists to save Werder from relegation in his very first season in the Bundesliga.
I'm not Mourinho's biggest fan, but i would have never thought he was an idiot. But ignoring KDB was one of the dumbest things i've ever seen a manager do. Just crazy.