Mulinassar and Othello

When Francisco first dons his disguise as the Moor Mulinassar, he is deemed noble by Flamineo's description of his deeds. Mulinassar is well studied in "state affairs" and "rudiments of war," has fought for Venice, and exhibits such commendable traits as authoritativeness and intelligence. To me, these descriptions are very similar to those associated with Othello in the beginning of Shakespeare's tragedy. How can we interpret Mulinassar in light of a comparison with Othello? What are we to make of V.i.100-101 ("Tis a ridiculous thing for a man to be his own chronicle") considering Othello's predilection towards telling his own story? How is race figured on the stage in the figure of Mulinassar and how does this compare with the staging of Zanche?