Yes, somebody (maybe you?) brought up that very valid point about the possible connection between our aggressive base running and the hamstring injuries. I have no idea if there is a causal effect there, but it sounds reasonable.
IMO, Swihart has looked just fine behind the plate, which would be my biggest area of concern over offense. If Swihart can indeed return on the 14th, and Vaz can return by early Sept., I don't think there is a need to look for another catcher.