Raise the cost, lower the 20ap you gave to it, whatever needs to happen in order to make this change:

Let Zhonya's keep the Unique Passive from Seeker's

At the moment, if you get a fully stacked armguard, your upgrading the Needlessly Large Rod and Armguard for 5 extra armor and the Zhonya's invulnerability for an upgrade cost of 625 gold... that seems kind of steep for no added stats

Watch out, AP Rammus and Malphite might be more common.

let the passibe stay

or at least the 25 AP u use to need to form seeker arm

u only get 20 when ugrade to zhonya and its same state it was before patch

I'm confused, Zhonya's gives you the same stats as a max stacks Seeker's and NLR (with an additional like 5 armor and the awesome active), so why would it need the passive? Wouldn't it just punish a person that buys an outright Zhonya's? If anything they need to lower the cost (and maybe stats) of Seeker's in order to make it actually worth it to upgrade to Zhonya's

The problem with Zhonya's was that the build path was pretty terrible in the situations you needed it. Seekers gives mids an effective armor ap item for the now prevalent ad mids. It's basically the ap answer to hexdrinker.