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You note discomfort with Carp, because his hits are clunky.  Fair enough.  But, the problem for Captain Jack is this ...
Jose Lopez from '04 - '08 posted the following Isolated Power scores:
.135; .132; .123; .103; .146 -- that's 2,300+ PAs of assessment.  (.145 in the minors, btw)
In 2009, Lopez posted a .191 ISO.  From a sabr view, Lopez was VASTLY more clunky prior to 2009.
Carp shows a .168 ISO in the minors, and a .148 in his 65 MLB PAs. 
The super-duper huge problem is that players CHANGE.  Even if Carp is clunky "today", it does not mean he cannot have a hitting epiphany (or coaching tweak), that produces a major plateau jump in production like Lopez had in 2009. 
Does Z see a .200 ISO hitter in Carp, just waiting to blossom?  Does he think with one tweak Tui can improve his eye ratio by an order of magnitude?  These are the kind of things that good GMs have to be thinking about -- but the public never gets to hear about, (except after-the-fact success stories).  You might hear, "Oh, yeah, we knew that he had the inate potential to hit 30 HRs.  It was just a matter of unlocking it."  You never hear, "Well, we thought he was going to be a 30-HR guy, but we were just absoutely wrong.  (I recall speculation that Sean Burroughs was going to DEVELOP power some day.  Pity it was the power to press his remote control regularly).