30 or so games of AAA production at age 25 doesn't automatically erase years of watching a guy's development and I think the book on Phegley is he's probably a borderline at best MLB player. FWIW, Phegley's a career .261/.319/.409 MiLB hitter while Flowers was a .275/.391/.484 hitter.
That being said, I say why the **** not with Phegley. I would be stunned if he turned out to be any worse than Flowers has been to this point.
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