Both Zinc and Mg def show up as very regular striping.
That is neither.

Rhizome is hinting at the possibility of a virus spread by an insect vector- sounds like he was thinking TMV- hm. Quarantine is certainly a good idea.

I'd repot now personally. Over a year, the plant might enjoy some more room to spread out, adn you can see how much root density you have while you're at it- have you seen the threads on bonsai mums? Very neat info for keeping a mother for a long period of time.