What’s more, Sean also does the motion capture work for Rocket on set, with Bradley Cooper eventually stepping into the studio to record dialogue, and extensive visual affects bringing the character to life.
On top of hearing about it from his brother, Sean is also an important cast member of the property.
While he’s not a bonafide member of the member, Kraglin has had a supporting role in the first two movies.
It stands to reason that Sean Gunn would be privy to more information than most, as its his sibling who is the mind behind the Guardians of the Galaxy franchise.