I don't think they want to risk him at this point. They need to start making some decisions on a lot of these players heading into summer and it's pretty clear Pulisic is one of a handful of keepers.
Yeah, you want to hate him and Robben (and the whole team really) but then the guy plays like the 50 year old at the pick-up game who's going to school the kids through sheer grit. You wanna hate him, but he was grinding today.
This team has no business playing with wingers, and doesn't deserve the quality they have in attack there. Schmelzer and Piszczek are ready for the next phase in their careers. They have over 400 Dortmund games between them, and no longer defend like today's team requires.