Thank you very much for this detailed answer, especially clearing the concept about Velayat Faghih. A lot of things make sense now when I look at them with respect to this concept. No freelancing Shia militias, I like that.
But then there is one problem, Syria is a Sunni majority state, right. Then why all these militias(Hizbullah, Fatemioun, Zaynabiyun and Shabiha) supporting the regime in power are mostly foreigner Shias (other than alawitte Shabiha). The answer I think is that they are tools that Velayat Faghih employs to further its strategic goals and currently it is to consolidate the ruling regime. Just like LEJ, SSP or their likes are tools of KSA.
Although I wish both KSA and Iran the best of luck, their safety is none of my concern but their own. But the fact that both of them are recruiting Pakistanis for fighting their proxy wars is something that concern me. When I was talking about Zaynabiyun I was not worried about Iran, I was worried about Pakistan. As per reports many of these guys are Pakistanis and they will come back one day. When I take into consideration your theory about Velayat Faghih, it will mean that their loyalties will remain with Iran because Iran is the Shia Islamic government, kind of Khilapha that Sunni groups are looking for.
Although I must say that it is quite reassuring that Shia militias won't go freelance like the Sunnis as they already have their Islamic state but that creates another concern.
So what if tomorrow Pakistan and Iran become hostile, its a far-fetched hypothetical situation, so let's stick with something more realistic, what if Pakistan decides to actively support KSA against let's say perceived Iran backed Hothis or any such militia and government. The last time such offer came, one of the biggest concern was the danger of sectarian unrest. So if Pakistan formally gets into anti-Iran block, can't Iran use its supporters, who will be well trained and battle hardened to create unrest in Pakistan?
In Sunni concept of Khilapha, once it is established then its edicts will be bound on every Sunni no matter where he is living. Is the concept of this transitional Shia government is similar or is there room to differ with edicts.
Thank you again Daneshmand for your Daneshmandana post.