Is Cassio any different of a person in Act 5? If so what passages might support a change in him?

Roderigo is ready to pounce on poor Cassio who is still rather clueless about the web of deceit going on. THe only real change in Cassio comes at the end of the play when all is revealed and Cassio becomes temporary leader of the troops at Cyprus. Here Cassio gets some control back and feels some redemption being given a greater position.