Nope. But the point remains; one need not be seen to have a major role.
Sauron never once makes an appearance in the Lord of the Rings (ehhh, the books, not the movies.) Yet, who can doubt he dominates the whole series?
Revan can have a major role and never once show up. Easily.
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I agree, that would be the best solution but it would still be nice to see him.