Zetas are just another type of ability mat, like the omegas or mk3s. But the thing is, it takes a while (usually at least 2-3 weeks) to get enough zeta mats to equip a zeta on a character, so you want to make you use them wisely. I don’t know what characters you have, but from the picture it looks like you have QGJ and Dooku, both of which you probably shouldn’t put a zeta on.
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And those numbers means “how many zetas on that characters”
In the picture, blue star w/ 3 means she has 3 zeta abilites.
R2 has two. And BB has 1.
In fact, BB-8 has 2 zeta abilities.
That cannot show which ability is zeta’d. Just notice to us “how many”