[@jynmi88] And the few that have the remarkable growth (if ever looking for some reason) could be the results of the Soul King's or to be even more vague, some metaphysical response to the appearance of the God-Tiered ones. Yhwach and his army, Ichigo and his friends, and the all around spike in power in The Soul Society.

Some kind of new breed or something like that.

Just a suggestion.