Its only going to cost about 90-125 for the rest of the season to have him up, which is about a games worth of parking, so why not. You bring him up now, give him extended playing time to see if he can hack it. If he can, he could be a solid back up or starter next year and that would alleviate that necessity is trade talks or FA. Similar to MM being brought up and has proven to be a plus back up if not starter. Granted he was hurt, but the production you are getting now might as well be from hurt players. Ransom is decent, but he isnt long term. Unless the Reds plane goes down at some point this year, this is a lost season. Start playing the younger guys and see what you have. Whats the worst that can happen, he sucks and you have to play Ransom more and still are in need of a SS next year. Who cares, they are there now.