It's possible that there is a seperate place of waiting in the Halls of Mandos for 'deceased' Maiar.
As for Saruman, it is briefly hinted at that he created his own ring (similar to but much less powerful than Sauron's). I kind of like to think that eventually he will reform via that ring and create a disturbance at the end of the fourth age.
- Cirdan / Maglor68
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