I decided to make Piccolo the same strength he was against #17 during the Boo Saga in my Battle Powers. In other words, I believe Toriyama forgot he ever went into the ROSAT for the Cell Games. It makes Base Saiyans > Piccolo work far better.
I believe his dream is to make everyone around the world throw a party after he becomes Pirate King. That's what happens after every Story Arc, anyway.