Yankees' Anthony Rizzo placed on IL with post-concussion symptoms weeks after initial collision

Rizzo collided with another player in May and initially passed concussion testing
He later experienced fogginess and decline as a hitter, leading to an IL stint
Rizzo's symptoms were atypical, appearing gradually after the collision
Neurologists say concussions can vary greatly in timing and impact
The Yankees believe they followed protocols properly and Rizzo agrees