You really think that Mr Game & the Watch, ROB or Duck Hunt would have made more sense than Ken Griffey jr ?
Obviously, no. Those characters are video games characters or video game related characters first and foremost. I'd argue Ken Griffey Jr. makes more sense than Goku, though. There was a whole series of games published by Nintendo starring him and Nintendo owned the Seattle Mariners for a long time. Much more of a history with Nintendo than Goku.