Come on, no dub vs sub elitist crap in here. Both are fine.
And I'm pretty sure Kayos is referring to Illya and Berserker showing up for 5 minutes tops in Part 1, yet getting big shots on the poster compared to Lancer and Shinji who play bigger roles in part 1, yet aren't on the poster at all. Same with Archer, since he has like 1 scene in the whole movie. Since this is a poster for part 1, not the whole route, I get Kayos's point. A poster is supposed to reflect what's in the movie, not what's coming up in future movies. It'd be like if Star Wars: The Force Awakens had Luke taking up a decent amount of the poster space, despite only being in one scene, while Poe and Finn, who have multiple scenes and plot points to themselves, aren't even on the poster.
Though at the end of the day, it's just a poster so who cares. That and a poster is also supposed to attract people to see the movie, which Cu, Hassan, and Shinji probably wouldn't do.
Yup. The bolded.