Oscar is very tired, I think that affected his performance in the NT.
Yeah, he tackled and intercepted the ball a lot, but he was far from his level at Chelsea - which sort of reinforces the idea that if we want him to play deeper we should expect him to disappear.
He has decent passing - short and medium distance, as for long passes, it's hit or miss, but something I think Mourinho could help him develop.
I still think the closer to the attack he plays, the better results he brings.
It was like that in Internacional and in Brazil u21 NT. Playing him on DLP or DM would be a waste imo, but hey, I'm Brazilian, we think and see the sport forward... (except Scolari, that is)