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Saunders isn't a late-bloomer though. He's a "fast" bloomer. Zipped through the minors faster than your average spec and starting to show promise faster than your average spec. Hit reasonably well at every stop.
Tui isn't the player-type that Werth is, but he fits more in the "taleted late bloomer" category. Neither guys blazed the minors, neither hit very well at every stop until things starting clicking for them in a repeat of AAA.
I don't know Saunders hes going to become a star like Werth, although there is that kind of upside in him. 770 OPS with great D in a corner and baserunning would make him a VERY nice player. If he starts running high RH/LH splits, you can take full advantage of that as well.