thanks for the comments.
i am well aware that there is no high beam filament in the outer globe, hence the different setup for the high beams. as for you comments regarding regarding the operation of high and low beams, have a look at some other cars. i checked on a lexus, lows stay on when highs are on, same on a 350Z, same on a barina, and i know for a fact that that toranas run on the same principle, they have only one sealed light and run two different filaments, one for each type of light, and even then the low beam does not go off when the high is on.
i hope that i haven't missed the point that you were trying to make..