User blog comment:IamJakuhoRaikoben/Chapter 444: Emperor Spriggan, Review./@comment-5303512-20150713200154/@comment-7418318-20150713211045

It was all just a ruse to occupy the Magic Council's attention so that Hades could gather the keys to Zeref's awakening without being noticed, with the destruction of Era being an additional bonus like icing on a cake.

I doubt Ultear put any throught into what Jellal might have called from the afterlife, should he have succeeded.