Rookie Years:
Carlos Gonzalez: .242/.273/.361
Jean Segura: .258/.315/.325
Josh Donaldson: .232/.280/.386
Alex Gordon: .247/.314/.411
Rookies go through adjustment periods. That's just what they do.
As far as hitting with RISP - That's such an insanely volatile stat because of the extremely small sample size.
Jose Reyes this year is hitting .202 w RISP. Last year - .383
Napoli is hitting .185 w RISP. Last year - .257
Zobrist is hitting .169 w RISP. Last year - .297
Hell, Allen Craig hit .454 w RISP last year. This year he's hitting .250
Last year, Bryce Harper hit .230 w RISP. This year he's hitting .205 with RISP. Are you wanting to bail on him as a player??
Judging a player by how they hit with RISP is absolutely ridiculous. You can complain about how a player has hit with RISP, that's fine, I understand it's frustrating. But to put any kind of predictive value to it is just flat out incorrect. Situational hitting has zero predictive value, at all, whatsoever. Otherwise, players wouldn't have their numbers fluctuate from year to year so much.
If you want to build a team around hitting with RISP, your top 5 names are David Murphy (.388), Adam Eaton (.377), Russell Martin (.371), Rajai Davis (.370), and Derek Norris (.370).
If you want to build a team around those guys as your core, you're going to have a lot, and I mean a LOT of last place finishes.