Bryan Zampella is most likely the actor playing Jason in GTA 6 (One of the two protagonists.)
This is a picture of him with Tim Neff, who was credited in Red Dead Redemption 2 AND had GTA 6 on his CV.
The picture was taken in New York in 2017.
As you can see, they’re doing motion capture work.
… and it doesn’t look like something out of RDR2.
joeyrubs is the Instagram profile of a former Rockstar employee who worked on cinematography.
Here he’s seen hanging out with Bryan Zampella in January of 2017.
Here’s a picture from 2017 on Bryan Zampella‘s now deleted Instagram account.
You can see two friends of his imply that he’s working on a big secret project.
His Twitter account now only has one quote tweet and a couple of replies left on it.
Other than that it’s been wiped clean.
I’ll let you all know if anything else gets discovered.