You are suppose to answer it, dun tell me you dun know. That's mean this is a serious flaw in your 10 pages long of stuff if you doesn't even know whether my question had anything to do with your 10 pages long of stuff.
If you really read My explanation you will know the answer.

Mr Dearest Viator, do having Zell in your party during the final battle have anything to do with your 9 pages long of stuff?
Having Zell in our party or not at the Final Battle is gameplay aspect.