[LOTM 1061] Question about sequence

If there is a great old one, is it possible to have Sequence 0?

Asking since Klein said there can't be sequence 1 if there's a sequence 0.

Though I am a bit confused since according to Roselle, those that converge will separate.

Doesn't this mean once a true god (0) was born, it's possible to have sequence 1 again after a period of time?