From the Prologue of A Game of Thrones, you have six Others murdering the Night’s Watch brother, Ser Waymar Royce:
And in his nightmarish vision in ASOS, Jaime's five slain KG brothers & Rhaegar are about to do the same:
Given @LmL's hypothesis that the Kingsguard symbolically represent the Others, these passages suggest a motif of six Others/kingsguard attacking a brother.
These thoughts kicked off an interesting Twitter thread involving several forum participants. I tho