"Upstage" refers to a term used in theater that means to draw attention away from someone or something, typically by standing or placing oneself in a more prominent position on stage. Full definition
Directed to resemble rather than act, Eastwood comes across as stiff and unemotive, though Diablo doesn't even have the sense to let its star get upstaged by the overqualified supporting cast. (metacritic.com)
Directed to resemble rather than act, Eastwood comes across as stiff and unemotive, though Diablo doesn't even have the sense to let its star get upstaged by the overqualified supporting cast, presumably because they would distract the audience from thinking about how he looks kind of like his father from certain angles. (film.avclub.com)