Forsaken has got to be the Greatest Flex player of all time in Valorant. Plays EVERY agent in the game, casually top frags, and has been doing it for years now. Deserves to win a Champs/Masters trophy.
I agree with the first part about the more agents being wrong, but I disagree with the needing to win "something" to be a goat flex. If you're a flex and consistently the main reason your team has good performances (like high placements internationally), even if you never win I think there is still a good chance to be considered a goat flex. It's why I also consider Mako to be the goat controller even though he's never won.