I think it's pretty apparent that neither your nor my team will automatically hold position. My point is, Zader and Zaul teams have a much easier time holding position. If you don't mind having to win back 5, 10, or even 20 positions every day then by all means use the zeta on QGJ and fight away. But if you like constantly staying in the top ten, five or even top three and having a much easier time in arena then don't waste your time putting a zeta on QGJ and use it where it do some good.
I seriously don't understand how you're not understanding my argument. zQGJ teams are relatively easy to kill for all teams and you will be targeted way more often than not.
The only toon that's a bigger waste of a zeta is chewie.