“Best” is a wide category - I meant one of the best in something relevant/unique, a lot easier than declaring you the champion of the world 
I’m speaking from a similar experience of my D, she found two teachers from outside her obvious strengths to nicely supplement her successful ED1 application to Pomona this year. Her math teacher didn’t declare her the next Fields Medal candidate but her compliments must have been intriguing - D is into languages and music.