A couple problems with this line of thought. Sano clearly isn't ready for the big leagues; he just jumped to AA as a 20 year old, and his old strikeout problems are coming back. We can't count on him in September, and we may not be able to count on him for much or all of next year. Similarly, Sano isn't even on the 40 man, and he doesn't have to be until 2014! Why push him up when he isn't ready when we're not in any hurry to trade Plouffe (not a walk year)? Plouffe is also young, cheap, and a valuable righthanded slugger. I think he's a good 3B option with the potential to become better. I'm not comfortable giving up something like that for speculative minor league assets when there's no one to plug that hole in the lineup. And speaking of plugging that hole in the lineup, Carroll isn't very effective this year. Last year wasn't great for him either, but I think it's becoming clear that his skills are declining. And don't forget that he holds a vesting option. If he plays enough, we are forced to pay him for next year too, and by next year, I think we'll probably want to move on. We could plug in Escobar into Carroll's utility role and do just as well for cheaper.