I agree, I don't see a 1x doing much good in that situation. If the the rafters are sagging in that area, adding a purlin would seem a better fix. Also, you cannot brace a roof off of a ceiling joist. I can't tell from the photo if that brace is sitting on a top wall plate, beam, or ceiling joist. I have seen 1x's nailed to the side of rafters before because there was a splice in the rafter and there was no bracing added. Now that is just a sorry framer using scraps!! Mike M