No, he does do the voice. I believe that Syler found what he needed from what was left of Eden's brain. Isaac couldn't show Sylar "The Plan" because he doesn't have it. And getting "brushed" to the floor broke the suggestion. Besides, the show has plenty of otherwise this, and why didn't they do that. 
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"I don't know that I ever wanted greatness, on its own. It seems rather like wanting to be an engineer, rather than wanting to design something - or wanting to be a writer, rather than wanting to write. It should be a by-product, not a thing in itself. Otherwise, it's just an ego trip."
Roger Zelazny
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