MSSJ Goku : 8,000,000,000
Cell (Vs Goku) : 8,800,000,000
Cell (real speed) : 10,000,000,000
---- full power: 14,000,000,000
---- Super Perfect : 20,000,000,000
SSJ2 Goku : 16,000,000,000
--- Majin : 20,000,000,000
I assume the Majin boost gave Vegeta exactly a 1.25x boost... Which would make SSJ2 CGs Majin Goku as strong as SPC... If Goku can keep a good stamina usage and not burn it quickly (Cell unlocked something seemingly SSJ2 alike too, so perhaps he has stamina issues as well) Goku would win after a rough battle. It'd be pretty difficult but when battle powers are equal, Goku is #1. Except against Kid Boo due to SSJ3 stamina draining but if he had the state mastered, even accounting Kid Boo's haxed regen, he would have won.