While it's true that ankles are easily re-injured, I don't think it has much to do with how soon you came back. It's the initial injury that weakens the joint, not really how long you rest it. Ankles heal at different rates depending on the severity but what you do depends entirely on how it feels. I've had ankle injuries that I incurred playing competitive basketball. If he's already walking on it and putting his full weight on it without assistance, he's already well on his way. The next step, is literally a step. Is he able to walk up and down steps normally, then he's close. The last hurdle will be pivoting on the ankle. The good news is that normal baseball movements are much less likely to injure ankles than a sport like basketball, where it's very easy to land on another foot. Most ankle injuries in baseball are from landing awkwardly on a base, just as Weeks did. To some extent you can control that. The issue with re-injuring is how much rehab you have done to restrengthen the tendons. Rest comes first, but if you don't do the proper amount of rehab then the tendons will still be weak and will be much, much easier to have the same type of injury occur again. I'm sure he'll be in some sort of soft-brace for the rest of the season, while doing rubber band and "alphabet" workouts to get his ankle back to 100%.