Give me a break. Juan Rivera. LOL. Even after last night he's got 3 homers 12 RBI and he's hitting .255 and he's 0 for 1 in SBs.
Just because a guy is getting playing time, or is 27 years old, or has a very good arm, or is batting in whatever spot in the lineup he is, doesn't mean he's useful, a sleeper, or going to have a breakout year, or even that he has potential.
27 Year old players don't have potential. 27 is when you're supposed to be in your prime. But when you've never done anything in your career and you're not a regular player, you're not going to have this breakout productive year.
He's just not good guys. Get off it.