Is the golden armor (Garo) the only one that must be passed from ancestor to descendant?
According to my understanding, the Silver Knight's armor follows similar rules to the Golden Knight's. Note: I've heard it said a couple times that the third series Yami wo Terasu Mono was retroactively declared non-canon, which would get rid of the sole instance in which a Golden Armor was inherited by a random. Further note: YWTM was utterly disappointing making it the sole entry into the franchise I didn't watch completely.