I totally agree with you on the closure part. I think Hotchner needed not only closure about Haley's death but the fact he killed Foyet in (understandable concerning the circumstances) rage. And them coming together and it all playing the way it did was exactly for the closure and a true ability to move on for Hotch. Also I find it very telling that Haley gave him the ring, her ring. I'm sure we might be having a wedding in the future.