User blog comment:Jkphantom9/OFFICIAL: Japanese Cast Announcement!/@comment-25555436-20150609194140/@comment-4010415-20150609203248

Ozpin and Roman are great because they're voiced by two people who  have previous experience in acting and voicea cting outside of Rooster Teeth.

Though, to be honest, it seems to me like the voice actors in RWBY who do voices in Red vs Blue tend to do a better job in Red vs Blue.