Radagast's Whereabouts and Gandalf's Plan...

2 Things.
1. I'm aware that Radagast's wherabouts have been previously discussed, but is it possible that Saruman captured him and used him to handle the crebain and wargs?

2. What WAS Gandalf's plan for getting into Mordor? If all things went well, and the fellowship stayed together, where did Gandalf plan to go, to get into Mordor?
It was obvious that he and Elrond were constantly looking at maps to see the best routes, but where would they go? Did Gandalf know about Shelob's Passage? Was there some secret mountain pass we don't know about? Did he plan to take a long road around?
Gimme your thoughts...