I am a woodwind player. I was a woodwind player in 1989 also, when I decided to audition for a brand new drum and bugle corps based in Charlotte.
Some time prior to my audition, I took the time to learn how to play a brass instrument so that I would be able to seamlessly integrate into a marching brass ensemble. I did not demand that the ensemble conform to my chosen woodwind instrument, nor was I offended that the ensemble did not offer me an opportunity to play a woodwind. I wanted a new experience, and because I chose to learn instead of trying to change an established performance format by force, I was ultimately rewarded.
Any kid who plays a woodwind and feels "left out" by an all brass ensemble should simply pick up a brass instrument and learn it. It isn't rocket science, nor has it ever been. When I say "learn it," I mean learn to play it with good tone quality and proper articulation. These are choices. If one is hypothetically as "talented" a musician as your premise states, there will be no real problems in doing this.
If, after taking the time to learn said brass instrument, one is still "cut" by drum corps B, then it just wasn't meant to be. Do you believe that every talented brass player who marched Americanos could make it into the Blue Devils, or the Cavaliers, or Carolina Crown? Of course not! This ridiculous argument that "everyone" should get to enjoy what we all enjoyed (by marching) is headed down the road of participation trophies and the like. There are absolutely no guarantees that every talented musician will be able to march in a drum corps and there never have been. And there never should be.