I'll try to get something up for you to respond to.
Poison the king? I was thinking of staging a coup right there and then. He has the triforce of power after all. Poisoning and the whole cloak and dagger planning would make more sense if he does not have it.
@Prince of Seraphs I went with the whole. 'Reincarnations so they each have their Tri-force.' I can also see where Green is going, think about it. On the day of festival honoring a Hero the sun was blocked out, Ganondorf tells them that the king cannot save them or perhaps tells them the king's line has magic to cause this or even stop it. The people of Castle town and all the others who are their rush to the castle the King not understand and his soldiers overwhelmed. He cannot end it, Ganondorf claims he can and that the King is lying. He promises to save them and thus Ganondorf is made king Hyrule and the thieves with no blood shed. Also with monsters appearing thanks to constant darkness the outlying towns would have to submit to him for aid or go it alone.
Link is defeated by Ganondorf during the final battle of "Ocarina of Time". After this, Ganondorf obtains all three pieces of the Triforce. Led by Princess Zelda, the people of Hyrule manage to seal Ganon and the Triforce in the Sacred Realm.
If a person with an evil heart gets the Triforce, a Hero is destined to appear and he alone must face the person who unleashed the Great Cataclysm. If the evil one destroys the hero, nothing can save the world from his wicked reign.