We have an event starring Knull. We can't get more minor than that.
I would suspect looking at what your competition is doing might play a part in it.Then why delay the book for almost a year? Then delay it again as we get closer to February? I mean maybe they were trying to catch some Black history month hype but why the second time?
Remember Cyborg? His first ongoing did not come out when New 52 started. Instead it was DOOMED Static, Jason Rusch, Batwing and Mr Terrific. Marvel tossed out Miles Morales.
His ongoing came out AFTER every other POC (mainly black) at Marvel had stopped. In fact I think the only POC lead books out at that time was Spawn, Rivers of London and Savage Dragon.
Cyborg numbers did fine until Panther, Miles, Sam and others of color started getting books out.
Then came Rebirth. He had a book that was above 20K until issue 6. Around the time the gators and others went all after Marvel for using POC as leads. It got worst as other companies started tossing out POC led books that got attention.
If you are trying to get all the attention (and sales)-Marvel thinks waiting will work. The thing is you don't know what will catch on.
See Future Slate New Batman. For as MUCH crying over a black Batman-it's selling and now we got a digital series. Redjack's Vixen and Green Lantern are on the way. Bitter Root, Killadelphia, Excellence, Farmhands, Far Sector and so on.
Marvel should have tossed it out when they gave EVERYTHING Black Panther away on digital media. So someone could stomach Coates run and be caught up and MAYBE buy those issues since they got all the rest for free.