We've had in order of appearance of final boss.
Ganon
Shadow Link
Ganon
Dethl (Nightmare)
Ganon
Majora's Mask
Ganon
Ganondorf
Vaati
Ganondorf
Vaati
Ganon
Malladus
Demise
Yuganon
Calamity Ganon.
So outta 16 Final Bosses Ganon occupies 9 slots if we count all forms. Or in his pure piggy form 5...