Tipping the scales.

This is something I've been thinking about ever since Pendulum Summoning was first introduced in Yu-gi-oh Arc-V. With Pendulum Summoning, you can special summon 1 or more monsters at once. Their levels just have to be in between the scales of the Pendulum monsters that have been set in the Pendulum zones. So far the Pendulum Scales of Pendulum monsters range from 1 to 12. But I have a theory that somehow, someday, Pendulum Scales can be increased and/or decreased to 13 and 0, like how there were Xyz monsters in the Yu-gi-oh Zexal anime with ranks of 13 and 0. What about you? what is your opinion on this subject?