For anybody watching the OVA on Toonami, got some bad news for you.

Most likely possible explanation (from ANN post's comments): Japanese licensing contracts are notoriously confusing. Sometimes the English distributers aren't actually getting what they thing they are, be it an issue with the usage rights, music rights, what footage they're getting (broadcast vs home video), or even translations. This is one of the major reasons why anime releases get delayed over here. I think there was a recent Answerman that explained this well.