You would be considered a Costar. Which is lesser to the "Star".

Trust me there is a reason why people are bitter about this in hollywood and about being the "Headliner".

Sometimes people will be advertised as a "Star" or "Co-Star" when their point is minor, or less important then the main star's if they are well known... however they are still not the star...

The Pitt/Cruise thing is more of a "Not wanting to hurt the others career or show favoritism even though one plays the more important role". Type of agreement.

Which is irrelevent in the case on the non-famous biker. There is no reason to call him a Star.

The same reason Megaman doesn't also star Dr. Light.

If he is just an important side character it should say he is "Costarring" in the DLC not starring.

So wouldn't it be smarter to just put "Co-starring" for a movie such as Interview with the Vampire instead of "Starring Brad Pitt and Tom Cruise"? Even so, "Co-starring" still makes it sound like both are the "Stars" of the movie.

If it were me, I would be bitter too.

This is all still just a rumor as of now, for all we know this Biker may be just another supporting character and not the games actual "Star". I hope not because if this DLC is as big as they say it is going to be I may even purchase it. I would prefer the main character to remain the same in his own game.

Edit - Just read your edited post explaining why they would put both actors down as Stars. I guess that would make sense.

maybe its more than just the biker but he's headlining the whole of the DLC as in it might be other features too along with the Biker as a character