i'm not sure what HG would benefit from going oversea's on this.. besides the pure delay. the japanese rulings were fairly clear cut. info from Big west would kill the HG case fast, and i can't see Tatsunoko being willing to lie in court to back up HG, given that Hg and Tatsunoko were at odds themselves recently and had to have an arbitration done.
frankly i think HG is getting desperate here, because this is definitely just meant to delay.. but it makes it look like they are admitting they don't know what their license actually includes and need to bring in an outside expert. Which is NOT an impression you want to give a judge that is already pissed off at the delaying tactics used so far, much less ones that rely on a thoroughly twisted logic about what the license allows that HG has been trying to use.