Gandalf and Sauron

[Arathiriel]

Possibly that may be part of it but also many Tolkein readers believe that Gandalf was allowed to return. The state of the wizards was really bad after the fellowship passed through Moria. Gandalf had seemingly persihed, Sauraman had turned to evil, Radagast had reduced himself to being a wandering vet of sorts and the two blue wizards had dissapeared, rumoured to be starting cults somewhere. Gandalf was the last chance and I believe he was given his life back and more power not by the Valar but by the one being who could- Eru. Sauron was destroyed, Sauraman was also killed and did not return. Hope that helps!

You know you, I think you're right: It was Eru not the Valar who granted his return to ME so that he could finish what he had started in the fight against Sauron. Because truly would any of the forces of light been able to fully deal with Sauron's after the treachery of Saruman?

Possibly not...