Okay so in the last episode of justice league unlimited season 2 it only focus on batman beyond and not anyone else in the league

so should I do batman beyond episode ?

Yes
I'll do the Batman beyond episode and that will be it no extra epilogue of what happened to Yn and his harem

Or

No
I'll make the epilogue of my own ending idea

Comment which one I should do only one and don't say both of them just pick one