And "originated" means whomever is listed in the Opening Night Playbill credits. Sometimes an actor did the role in a pre-Broadway tryout or in Previews and got replaced (a la T.V. Carpio replacing Natalie Mendoza in SPIDER-MAN TURN OFF THE DARK). If that happens, it is the actor who performed during Opening Night. UNLESS, however, the show petitions otherwise.
Two years ago when BILLY ELLIOT was nominated, all three Billys shared a nominated even though only one performed on Opening Night. This is because the show petitioned for that to happen and they were granted that special permission. HOWEVER, they did NOT petition for the actors playing Michael to share a nomination, which is why only one of the two actors who shared that role received a Tony nomination (the actor who performed on Opening Night).
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle