I agree with Christmas on this. He asked me to come in and see if Rice was walling, without any doubt this guy is.

1) Normally he waits a few seconds and leaves spawn after he sees no one at the double doors, but if one stands behind it and not even show that he is there, he will sit there waiting forever,

2) In my demo about the first or second round when he is going Long A, watch his crosshair, look exactly how the CT went from the bombsite to Short A then jumps down into Spawn. the guy never revealed himself and out of the blue he looks that way (not exactly on him) throws a grenade to the exact pioint where he is going to be and shoots.

This guy shows everything for being a waller.

---EDIT---

Short demo because I automatically went to play the demo with sv_cheats 1 and mat_wireframe 1 and saw everything.