I don’t know 🤷‍♀️

Yes I know he is canon, as Robbie Reyes in Agent of S.H.I.E.L.D., but if they bring back Ghost Rider in the future, I don't think they will take Robbie again, there was rumor about a return of Johnny Blaze, and I was wondering about your theories about how Johnny could get his power back from Robbie, keeping Robbie's GR canon

It’s definitely a stupid idea, but the best I can come up with is: there is more than one Spirit of Vengeance out there.

Johnny gave up his power to Robbie, but that doesn’t mean another Spirit of Vengeance can’t possess him later on.

Again, stupid idea of lazy writing, but that will likely be what we are told or expected to believe due to the fact that if they bring in Blaze, references won’t be made at all to AoS.