Yeah, it's just a theory.
To go a little deeper, a few things:
He makes references to illmatic and other Nas related things. If I were an emcee coming up whose selling point was that I sound extremely like Nas I wouldn't dare make reference to anything Nas related in my rhymes. That's like career suicide.
Also, from certain comments in this thread, the way I understand Nas' character/personality is that he'd always want to re-spark his passion for the genre/artform. I'm almost certain that he admires the wave that artists like Jay Electronica and MF DOOM have and as a down to Earth guy he'd find some excitement doing something like this.
My last theory/observation is that someone like Nas would do this just to say "Look I gave you an organic buzz with the Droog alias spitting pure fire and it blew up because of it. Y'all can't front on me anymore because I did it twice." Something to that effect.
Everything about this screams "true artist" and Nas would be smart to use his tenured platform to create a secondary revenue stream as this Droog alias because watching how MF DOOM works, every time something DOOM related is announced people get their money ready. Nas could eat off of this Droog thing forever (in addition to eating off of being Nas forever). Think of the possibilities. Money dries up when artists get "old" and they aren't "hot" anymore in the visual department so what better way to get people to always feed into your product than by getting them hooked on purely the talent?
At this point I'm almost hoping that it's Nas because this will ultimately be the perfect way for this dude to continue spitting into his early 80's without ever feeling that he can't get any more sales because the kids are seeing his gray hairs.
TL;DR Nas is building a cult-like fanbase within his cult-like fanbase and he already had the blueprint laid out for him with artists (and friends) such as Jay Electronica and MF DOOM.