A wonderful and interesting concept that.
Having 2 sets of cycles instead of just one. ( or even more )
A long cycle and a short cycle for instance.
Long cycle cards can remain in circulation for the legal environment for lets say 4 years.
Short cycle cards for 2 years.
Sort of a advance version of what we used to have called Eternity bug, which was legal for more than 1 core set.
This would be extremely interesting and beautiful. There are tactics, abilities and traits that remain through several generations of rokugani that are lost then relearned through the millennia.
It would go in sync as well through a lot of story line arcs that have yet to come.