Ideally, you would want Guzman to finally find his hitting stroke, because his glove has been excellent. I've not once seen Tom McCraw talking with any of the players, he's always sitting by himself. You'd think that as a hitting coach, he would be talking about certain aspects of their hitting... If this team had an owner, does anyone honestly think McCraw would be with the Nats?
As for Carroll at SS on a regular basis, that's not a good idea, he doesn't have the stamina to do the job every day, and when he does, we've how his bat deteriorates.
Even free agents signed to 4 year contracts can get traded, but that said, who would the Nats trade for? Who might be available?