I think everyone does, and it is the same theory. He is someone's Operative, and now they are pissed he is gone and they didn't get something they were promised. So many civilians demanding Saudi's heads on this before a thorough investigation can even be completed. Mainly because they don't know and understand the word, "Clandestine", and what may be below the surface.
Unless we know why the Saudi's wanted this guy dead, I can very easily see someone creating a situation where support for the Saudis is lost. And as it sits right now, either the Prince did order this, or someone just initiated the first move in a soft coup against him by making Saudi Arabia Public Enemy #1. Yes Saudi could have done this, but just because the Media is spreading that it would have only happened under the Prince's order, doesn't mean that is true.
Funny how they are making a big deal about this but were not making a big deal about missing Interpol Chief Meng Hongwei, who only recently was discovered being held in China. Prior to that no one made a big deal about it.