Why? Look at Nxt. It is clearly the next Generation of Crypto Currency. Where does this leading position come from? Definitly someone, who is involved in Crypto-Dev for a long time. Someone for whom Bitcoin is from yesterday. Nxt is Ethereum..right now 
Nope. James' ego is much, much fantastically larger than SN's. Not the same person. Besides if you are referring to the creator of NXT he went by the name BCNext.