I got three
Thrawn Lead- Way back I got real excited about the prospects of Thrawn lead w/ Shore, DT, and like Krennic and TFP or something. Went ahead and zetead the lead. Never used the team, Krennic isn't geared, TFP is barely geared. Don't think the zeta makes any difference on the rare occasion I use the lead.
Hoda - Do or Do Not - As soon as I saw this zeta I was like "This will be great for escaping". Put plainly, it is not. Should of done some research or something. Hoda barely escapes, and while this zeta does mean I put out a little more damage when enrage hits, I wish I had put it on the heal or saved it.
T3-M4 - the def pen one - Stopped gearing this dude earlier than expected, but the only reason I regret it is because I wasn't paying enough attention and thought I grabbed the other zeta.