Biggest deterrent to me about this article is the fact that Cody Ross came out and denied the claim.
You've got the usual suspects in Beckett and Ortiz coming out and saying it's a close knit group (Beckett even said that they hang out together on off days, families hanging out, going on trips, etc). But Cody Ross isn't one of the more outspoken guys. He generally keeps to himself, so the fact that he addressed it makes me think that the "poor chemistry" is more FO related than team related. Which would make sense, because Olney also says it's not something that will inhibit them from winning games.