Numerical order for Baroque works, Card order for Beast pirates and Planetary order for the Gorosei. There is no reason to believe they aren't scaled in the same manner as most other organizations the crew has fought. The only question is who'll fight Topman, because I'm leaning more towards Sabo than anyone else. The "Topman" of the celestials VS the one who'll take the helm of the organization created with the purpose of destroying the celestial system, seems fitting to me.