I am a self-confessed ignoramus when it comes to Holtby. I had only heard of him in passing before he started being mentioned in this window, therefore it is good to see him playing in some extended highlights of a single game rather than the usual YouTube compilation.
What does seem increasingly clear is that if people are expecting a midfielder to play in the '2' of a 4-2-3-1, they're going to be disappointed. He is clearly an attacking midfielder who for us would play in the centre of the three behind the striker. I think in that role, between Bale and Lennon and behind a top striker, he'd do well, although from his stats he doesn't seem to score many goals.
What he doesn't do is relieve any pressure on us as regards Sandro's injury. Everyone's reaction to Sandro's absence seems to be 'get Holtby in now', but he won't give us any options from a defensive perspective. He plays the same role as Dempsey and Siggy from what i can tell.