Inspiration does not mean you take all aspects of some thing and create something else. Inspiration means taking certain aspects from something that appeal to you and tweaking them till you have your own thing.
In the case of Warcraft monks, Blizzard most likely took the mastery of combat from the Xiaolin monks and the focus on Zen. It doesn't mean it has to completely adhere to the complete real life definition.
And it certainly doesn't mean that a dragon can be called a tomato. The definition of a paladin in real life and the definition of a paladin in Warcraft are different. The same with monks.