I'm just guessing but it's probably because Ryan Theriot has outperformed Ronny Cedeno at the major league level. Just a guess... If Theriot is just short of terrible, that makes Cedeno what - far short of terrible then? This is not a difficult argument. Ryan Theriot is a below average baseball player - we all know that. However, he is the best shortstop the Cubs have and better than Cedeno. No, it makes Cedeno a pretty unknown quantity whose floor is Ryan Theriot's ceiling.