I agree with you, normal league wear.
I don't know what is about the Braves, but they sure have a lot of players injuryed, even when they swing a bat they go down.
What if these guys played football, they would never play a down.
I'm sure there is wear and tear on their joints like their shoulder, knee, and wrists if the have been playing 10 or more years, but age 21? It is disturbing to see a player miss a week or two of playing from swinging a bat. I think their conditioning needs to be evaluated and see if they are over-stressing certain muscles.