The anti-Houthis in Yemen are, a lot of them, Al Quaeda, the guys we have been bombing.
That is another Sunni-Shiite war a la Iraq, with some very similar players, or rather a three sided war (at least).
Lucky for the Saudis is that the Houthis have the north of Yemen and the Sunnis the south, so the AQ types have to get through the Shiites to make trouble in Saudi. Its sort of a religious geographic sandwich.
Its an unholy mess anyway.
That is an unholy sandwich, indeed. You're saying that the Shiites, who are supported by Iran and therefore have no love for the Saudis, are the bulwark between them and the more radical Al Qaeda Sunnis, who although co-religionists to the Saudis, want to get at them? The Middle East give me a headache.