Is Luigi actually overshadowing Mario now?

[Kriven]

I don't think fan popularity has very much to do with whether a character is overshadowed or not in the primary canon... just look at things like Derpy Hooves where fans have latched onto pretty much a non-character and treated them as part of the primary cast. That doesn't mean she is an important character (or even a character anymore) in the official canon, and the same can be said for Luigi, who, despite being a playable character in recent games, is still relegated to an end-game unlock. I mean, he's not even P2 anymore for a lot of games.