The season began with the Twins concerned about the bullpen and shortstop.  Just 11 games in the concerns about the bullpen are not there.  Joe Nathan has been solid after a bad outing to open the season.  He is 3 for 3 in save opportunities and has his velocity up to 93 MPH.  Matt Capps has looked real good and Glen Perkins and Dusty Hughes have been consistent.  Alexi Casilla is hitting .143 and has made many mistakes in the field including an error against Oakland Saturday that allowed the only run to score.  The Twins don't have many options in the organization at shortstop.  Matt Tolbert can play their but isn't much of an upgrade, and there is no heir apparent in the minor leagues although Trevor Plouffe is hitting .348 with 3 homeruns and 6 RBIs in 6 minor league games at triple-A.   The Twins could still use an ace starting pitcher but trading for a good defensive and veteran shortstop could happen before long if the Casilla struggles continue.  Francisco Liriano is the other top concern.  He is 0-3 and hasn't been competitive in 3 starts.  Prospect Kyle Gibson in his first triple-A start allowed 3 earned runs in 3 innings.  He doesn't look ready yet.