Machinehead
GoAwayTrouba
He'll truly be great even if he never learns how to block.Sanchez will be a top 3 catcher offensively in the game throughout his career and may go on to have an all time career offensively as a catcher. His issue has been and will continue to be defense. He has a great arm and he's decent at framing, but he has shown some major lapses keeping the ball in front of him. If he can be a consistent blocker, he can be truly great.
If he learns how to block well, he'll be generational.