The offense would have to be good enough to put Blanco in at SS, I think. Unless you want to rush Castro, and I'd prefer not to. If the cubs acquire Granderson by letting go of Marmol and Theriot, i'm all for it, even if it rushes Castro because i think Castro would still develop with the big league club under Jaramillo. The key would be not hurting his confidence. If he comes up and puts up a .220/.230/.385 line this year, how does he handle that? I don't know, but I'd prefer to take it slowly with a promising player as young as he is. I think he'll handle it just fine. He's only 19 yrs old and reading some of the spanish articles and english articles on him, he seems to have a lot of self confidence. If he was a player that was passive and kept referring back to the organization when asked about his developed then i would agree with you but from all the quotes i read, he expects to be in the big leagues this year and is confident in his skills. I don't know that it would hurt his psyche at all or that he would even struggle if he came up. I just think it'd be rushing him for little reward – he's unlikely to be particularly good this season and then, as Neuby mentioned, you start his arby clock earlier.