-Youre assuming this is his only task. hes a very senior artist so he probably has to deliver concepts, direction, managerial duties, etc
-Doing story art is easily one of the most time consuming tasks in any game, hell in Skullgirls that was one of the biggest issues in order to get content out on time, which is why the art style is kind of sketchy and that game has way less story art than SFV does
-Look at the feature as a whole, Capcom is saying takes about 4 hours to finish, then youre looking at 4 hours or more worth of art, and just one artist? Thats a tremendous understaking considering the amount of unique art each character had in the prologue alone. They are banking more on variety of content than polishing a small amount of images
-Bengus is rushed because the stories for all original characters still needed to be finished and he needs to work ahead of time so that art production is not an issue for the engineers and rest of dev, publishing team. This is something fans have a hard time relating to and if you wanna say "well fuck it I want shit to be pretty all the time fuck these assholes" thats all fine and good but Im just giving you information on how this shit actually works, especially from Japanese devs who make a routine out of working way harder than anyone in the industry, by a mile.