According to the Micheál MacLiammóir's wikipedia entry:
"His Iago is unusual in that MacLíammóir was about fifty (and looked older) when he played the role, while most Iagos are about thirty-five or so. This may have been because of Welles' intended interpretation - he wanted Iago played as an older homosexual consumed by jealousy for the younger Othello."
I remember reading somewhere (possibly in "This is Orson Welles" or "The Magic World of OW") that John Houseman was sweet on Welles.
It seems as if Welles was once again shuffling his deck of facts and fiction and asking the audience to pick a card, any card.

