Answered already. See the Water/Coffie stuff.
Or must I say it again? The Gate Rune was a true rune wich was broken in two using a technique of some sort. Because it was broken in two by force wich made it a Half True Rune. While the Dark Blade and Bright Shield rune were NORMAL runes that only when combined forms a True Rune. It is even possible that the Beginning Rune was never formed before Riou and Jowy got it. And its also not sure if the Gate Rune pieces can be reassembled.
The water/Coffee stuff says that both runes are equal, that’s why they both grant ageless. Your affirmations cannot be both right, if you want to follow the water/coffee theory. Are the runes different or are they equal?One has the power to summon monsters(front gate rune) and the other to send them back to the Emtpy World (back gate rune).
So... who broke the rune in two? Didn’t Leeknaat and Windy bear this rune because they are the last of their tribe?
Didn’t she have Yuber and Neclord with her? Along with the entire SME army working for her? Do you mean that with all that she still couldn’t overpower her sister?She probably wanted both but needed the Soul Eater first so that she can overpower Leknaat. Thats just my guess.
But if Leeknaat is stronger than her sister, why doesn’t she go after the other half, I bet she doesn’t like when her sister goes around burning down villages.