The second part strikes me as an odd sentiment since the leakiest developers are the biggest teams at Ubisoft, Activision, EA, and Take-Two.
We've been sitting around and having Assassin's Creed 2017, Titanfall 2, and Destiny 2 leak all over just in the past month.
Only a very small number of people in those teams would actually be working on the NX version (or even necessarily know that there's an NX version). And considering games like AC, COD, Destiny, etc, have hundreds of people working on each of them, it's actually surprising how few leaks we get. Hell, I don't think we have any idea what Rockstar's working on, and they have a staff of 900 people, most of whom must have been working on something for the two and a half years since GTAV released.