Mild or not, concussions are tricky things. Justin Morneau of the Twins had a collision at second base in the middle of the 2010 season that didn’t look like a problem at all, yet Morneau hasn’t been anything near the same player since.
You can bet that the Braves will take every precaution with Hanson, and even then, it can be difficult for players to return from concussions, no matter how “mild” they are.
