Gandalf discussed this, didn't he? I mean, Frodo's cousins' usefulness in the end. Wasn't he talking to Aragorn (if I remember correctly) when he said that Pippin's foolishness in looking into the palantir provided Sauron with the idea that Pippin was the Ringbearer, captured, and in Saruman's custody; and that therefore whoever "made" Pippin look into the Palantir, now had the Ring? And if it wasn't Saruman, then it must have been Aragorn?
Isn't that why Sauron took Aragorn so seriously when Aragron himself looked into the Palantir?
Pippin was as 'useful' as a Ringbearer Decoy as Elrond would have been in diplomacy. Elrond could not have talked Sauron into believing that Arqagon had the Ring, and so, taking Aragorn seriously for the rest of the war.
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...down to the water to see the elves dance and sing upon the midsummer's eve.
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