Claig .... are you really trying to say that Sunni Saudi Arabia is as middle east expansionist as Iran, that has used the likes of Hezbollocks for many years????????????
For a start there is a difference between 'terrorism' and a proxy war.
Saudi Arabia, with the fall of Sunni Saddam in Iraq, threats across the bridge in Bahrain and impotence of the West in Syria, where Iran is tightening their grip on Assad and therefore Syria - is feeling a very insecure, wealthy, Sunni bunny.
'Cause and effect', when the West turned away from Syria, THEY THOUGHT THEY HAD TO STEP IN, they have not started wars as far as I can see.
If Saudi Arabia can no longer trust the West to 'protect their mutual oil interests' (especially Obama and a U.S. that will be energy self sufficient via Schale/fracking etc in a few years), then they will turn to dodgy mercenaries, as most middle eastern countries do, when using their army in uniform is politically incorrect.