to echo another poster's thoughts, I think the only reason the union in conjunction with MLB is coming out now to backup Ortiz (instead of ARod) and try to cast doubt on any future leaks is 1) Ortiz is simply more liked by fans, players, media, etc. than ARod, 2) it's the last bullet they have to counter the drip drip drip effect of leaking one name or two every few months.
I'm thankful in part that they're doing this now and not before ARod's name came out because undoubtedly ARod would have denied everything and played the Ortiz excuse.