Yes, they are, and not only them. Game of Thrones has plenty of heroes and at certain points, if you rooted for two who become enemies you will have to choose and if the writing is good it wouldn't be an issue.
What? Did you think a story could only have one hero?
It's not my definition. You are not arguing with me here - you are arguing with the entire field of dramaturgy.
I gave you the definitions for hero, protagonist and main character. Not my definitions. THE definitions.
Hey, being obtuse is your prerogative.