Well its actually real simple.. In the jungle Desmond told Hurley not to worry about Jack, Kate and Sawyer because Locke was going to find them and take care of that. When Hurley responded with "But he's trying to save ecko right now" Desmond told Hurley that Locke WILL take care of everything because he said so in his speech.
Ofcourse that was a bit odd BUT when Locke actually GAVE that speech, Hurley couldnt believe his ears.

Desmond has got future telling abilities.. no doubt. The actual question should be.. did he got that from the implosion or did he had it before?

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