I think Deboer views Nieto and Wingels as vanilla players. By that I mean, they are passable in every area, but do not excel in any areas. Haley, Ward, Karlsson, Meier, Labanc, Tierney or whoever can all do at least one thing noticeably better, even if they sacrifice something in another area. So he's going to play the players he feels at least have the chance to make an impact play, over the guys who are just warm bodies.
Regarding Demelo and Schlemko, god knows.
Regarding Demelo and Schlemko, god knows.