You really think Dirk doesn't play outside?
What with all of those 3's he jacks?
Incredible shooting and ball treatment, no doubt about it (pay attention that I'm italian and I'm speaking well of a German guy
), but he starts from the center (his natural position) and go outside for shooting.
For Danilo is natural to start outside, he doesn't have the weight (not in physical sense), sense of position and the habit for playing under the table (much more physical basket, fighting).
Dirk is a number 4 but he can play number 5, Danilo is a number 3 and he can't play number 4, maybe number 2, because he doesn't have the right movements when he has the basket on his back (Dirk is great in those situations).
Maybe I'm wrong, but the difference from a "long" (it's how here we call number 4-5) and an "outside" (number 2-3) doesn't only depend on the height.