Actually I believe Imrahil was included in the movie; apparently he's the blonde knight who takes the wounded Faramir up to the Citadel (which is indeed what Imrahil does in the book). I think it was described on a Decipher Card.
And anyway, I think Gothmog was needed to give the Orcs a sense of realism - by giving them a leader on the ground who gives the Orcs orders/encouragement/insults, they function more realistically as a genuine army than just a faceless mob of enemies.
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'Dangerous!' cried Gandalf. 'And so am I, very dangerous: more dangerous than anything you will ever meet, unless you are brought alive before the seat of the Dark Lord.'
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