Whilewriter/director James Gunn just recently headed to Atlanta, Georgia, to commence a whipping ten months of production, his brother, Sean Gunn, recently stopped byto briefly talk about his return in the highly-anticipated Marvel sequel.said Gunn of thesequel.Could Sean Gunn doing pre-VFX work on set be an early indication that Thanos will in fact return in? Probably not, especially given Marvel now has Josh Brolin signed on prior to filming's commencement, unlike the firstmovie. Gunn is probably referring to being the on-set Rocket Raccoon again given Bradley Cooper wouldn't be needed until post-production. Nevertheless, Sean Gunn had another contribution tothat he's also proud of: