As good as Jameson Taillon was there is a reason to be concerned, his fastball is straight as an arrow. There is a reason why I ranked Guerrieri above him and that is a huge reason why. Guerrieri throw 92-94 but with tremendous movement and his curveball is as good as Taillons.
Did you not see the run on the fastball that struck out Mauer for god's sake, seriously can you not see that ball move or are you just blind?