Um, why are we assuming that Sauron had a second in command over all of his forces. He wouldn't really need one. He could directly communicate with his Lt. for each of the various strongholds and armies he commanded without a need for an intermediary. Also, he is a very power hungry, jealous, and paranoid individual; do you think he would really allow another to have power so closely equal to his own.
And, if he really did have a second in command, it wouldn't necessarily be who is the most powerful physically or mystically, or even who leads the armies. Rarely would someone so high in the commanding hierarchy be put at such a risk as battle.
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"Come away! Let the cowards keep this city!"
-- Fëanor to the Noldor
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