[ecurbh]

I also think, though, that Frodo makes a major leap in his taking on the role of leader when he leaves the fellowship and he and Sam go off on their own.

And that is why in the film, Gandalf thrusts the Moria decision upon Frodo. He knows (or suspects) that the Fellowship will eventually break, and that Frodo will need to be able to take decisive action.

[Penny1]

Yes, that is an interesting moment in the film.... I think also Gandalf knew he might not emerge from Moria and knew that not only did Frodo need to be able to make important decisions, but the others needed to learn to see Frodo's decisions as valid, especially Boromir.