I don't think the entire DLC list will be 3rd party, but I don't know that we're looking at a mostly Nintendo lineup either.
Nintendo may want to push their own products, but the concept of adding 3rd parties in for DLC could absolutely play a solid role in getting big IPs from other companies onto the Switch.
To be honest, I think we really should dial back what we think is confirmed and what not for DLC. I've already read what some others have said on the matter, and I completely agree. Sure, there are rumblings about particular characters, but it's only these few people mentioning them. It just seems...odd. Hitagi has been more or less all over the place and seems to answer in the most vague way possible, yadda yadda.
Well, all I'll say is that nothing is confirmed until it is revealed officially, is leaked, or from word of mouth. For me, it would be entirely refreshing to see that practically none of what has leaked is in.
I do think Verge is somebody to pay attention to, but besides that I don't feel that there's much to follow. Sure, Hitagi has had information they've been leaking, and yeah they'll been right with other games. But, i'm starting to feel like there's something...off with all of it. I can't really put my finger on it, but it is what it is.
We've got a notorious piggybacker in Verge. He hit a grand slam with Smash Ultimate, but who knows why he got the Grand Slam. He very easily could have simply leaked information that was very obviously real to the people who knew, and he decided to leak it.
Eh. We'll find out soon enough. I just need this damn game lol.
(by the way, Let's Go isn't that bad. It's just not as intensive or interesting as the mainstream Pokemon games. I'm mostly invested because it does take me back a bit, but I want in on that Meltan swag...damn you Game Freak, DAMN YOU!)