> I find it interesting that the most notable names from P0 team aren't native US citizens.
How do you know?
> Even with dual citizenship they won't get clearance easily to work for NSA.
Not being a native citizen doesn't mean you are a dual citizen; those are orthogonal concepts. Dual citizenship are frequently native-born (having citizenship-by-birth in more than one country is a common route to dual citizenship) and naturalized citizens often do not retain foreign citizenship (they formally must renounce it, but some countries don't automatically—or ever—give effect to such renunciation.)
How do you know?
> Even with dual citizenship they won't get clearance easily to work for NSA.
Not being a native citizen doesn't mean you are a dual citizen; those are orthogonal concepts. Dual citizenship are frequently native-born (having citizenship-by-birth in more than one country is a common route to dual citizenship) and naturalized citizens often do not retain foreign citizenship (they formally must renounce it, but some countries don't automatically—or ever—give effect to such renunciation.)