What would be point of Aizen bringing him back without Hogyoku. Aizen already lose his zanpakuto, and it's possible that he lost all his powers (considering Ichigo hinted what Aizen's wishes were). So, Aizen could potentially be just ordinary soul know and if he don't even have hogyoku now than I really don't see point in bringing him back. Sure he still has his brilliant mind, but why would anyone risk to let Aizen be free only because of that when they already have one even more brilliant mind - Urahara.
Aizen will need Hogyoku because he will likely play role in defeating Yhwach. To return his shinigami powers, or to get some new powers, or to transform more, or to return powers to Bazz-B (yeah I like Bazz-B), we will see.