Flip that around: would Marvel want the Star Wars guy to include the Guardians of the Galaxy in the next Star Wars movie without proper oversight? I don’t think so. We’re all pretty good at synergy, but throwing everything together into a creative free-for-all isn’t synergy, it’s chaos. Marvel works because the people involved on all levels understand the Marvel characters and what makes them work intimately. The same is true of Star Wars. And that level of understanding can’t be conveyed in a memo.