Read this one paragraph from the #20 update again.

"Finally, consider one of the psychological factors that can come into play. Let’s say you see a particularly bad rumor…maybe it was for some really unsatisfactory pay rates, some kind of unforgivable concession, or whatever. But then the actual Tentative Agreement appears that includes something similar…just not to the negative level included the rumor, or as significant in the context of the overall agreement. You may find yourself saying “well, that isn’t so bad”. You may have been pre-conditioned by the really bad rumor into considering something that was still not all that great...just not as bad as what you had heard. "

There are several sources of rumors - whether from the company, from union reps, or that 30yo in his mom's' basement (much worse than the 13yo) - but I think this is one of the biggest reasons for rumors/leaks from the company. This is straight from "The Prince," by Machiavelli, an extremely dangerous and effective political tactic. Don't fall prey to it!