Greek, the idea of re-directing to another page is risky if Google finds out about it. They don’t like redirects of this nature and will ban sites for it.
KW, to answer your question directly, PR only has to do with inbound links. Keyword optimization has to do with the anchor text of the incoming links and the on-page copy and the way it is arranged. The rest of this discussion is really about the position of this site in the SERPS, which has to do with many factors, PR, inbound links, age of site, etc.