Well, Gollum wasn't to be trusted, though without it would have been in vain. I t would have been in vain already at the Morannon, for either Sam nor Frodo knew of the other way.
Even the Wise can not see all ends. If Gollum was to be trusted and didn't take the Ring from Frodo... well, I don't know what would happen. Maybe Samwise the Strong would sacrifice himself in some way. I guess it would be less hard for him than leaving Frodo in Cirith Ungol.
greetings,
lathspell
P.S.: After all Gollum is to poor a name for the creature, he is the one that (accidently) unmade the Ring... he is therefore Lord Smeagol
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'You?' cried Frodo.
'Yes, I, Gandalf the Grey,' said the wizard solemnly. 'There are many powers in the world, for good or for evil. Some are greater than I am. Against some I have not yet been measured. But my time is coming.'
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