User blog comment:Xilinoc/Ch. 632 - friend 2/@comment-5551986-20150626183058

Dunno what everyone else took from this chapter but it sounded to me like Yhwach's other half is always deemed an incomplete Quincy and could have been trying to reincarnate perhaps once every ten years. But they were always culled before Yhwach could find them.

All the incomplete quincy could never use Quincy powers because if they are the other half Yhwach would sleep then they would gain powers but maybe they just slept at the same time, so if Jugo could pull an all nighter he might actually become a decent quincy. Yhwach gave him the letter B so he could use his Quincy powers during the day too maybe?