DCEU: 10 Things We Learned From 4Chan's Latest DC Movies "Leak"
4. Ocean Master Will Be In Aquaman
The Rumour
Legendary DC villain Ocean Master will be in Aquaman but Black Manta will be the main villain, setting up the former for a bigger role in a future film.
Response
The Black Manta story is already out there, and shouldn't come as too much of a surprise. Meanwhile, Ocean Master was linked with the film as far back as November 2015 by JoBlo who had him pegged as the main villain.
As much as it would be nice to see Warner Bros taking Aquaman seriously enough to stack the villains, doing so would be a bad idea. You'd end up with nowhere to go in the future, even if you keep Ocean Master back. It would just be another case of Darkseid in Batman v Superman - a lingering presence that does nothing more than undermining the villain who's supposed to be the main focus.
Just choose one or the other and work on fleshing them out properly.