I don't believe that's possible. If they have two nodes then they're still not a part of a defined path. For instance, someone can go through their entrance nod

I don't believe that's possible. If they have two nodes then they're still not a part of a defined path. For instance, someone can go through their entrance node and come out someone else's exit node and vice-versa. The NSA would have no idea who is going through where and shouldn't be able to correlate the data.