Board Thread:General Discussion/@comment-27083746-20160213161250/@comment-26475399-20160213235126

This is a really good question.

Ginjo stole Ichigo's Fullbring, but it was stated by Rukia that Ginjo (nor anybody) would ever be able to steal the inner power that is part of Ichigo's soul. This part of his soul from where all of his hybrid powers emanate. This fact was displayed through the tattoo-like markings on his skin and the re-design of his Bankai attire; his Fullbring was stolen, but its influence still resides within.

As well, Fullbring is an ability only possible through Hollow influence. Ichigo naturally has Hollow power as part of his Shinigami powers. Hence, his ability of Fullbring is connected to the rest of his powers. So if he was to ever use Shinigami power without Fullbring, it would simply be a choice to not use Fullbring while in Shinigami form.

Case in point, Ichigo should definitely be able to re-learn and perform Fullbring abilities; while in both human form as well as Shinigami form.

It would just be a matter of Ichigo wanting to re-learn this ability, i'd say.