Hi Ron, I think I said that incorrectly. I did exactly what you're suggesting. I parked site1.com on multisite.com and that works perfectly. The plugin handles it and the correct site is served.
However, I can't seem to park http://www.site1.com on multisite.com and when I go to http://www.site1.com in the browser, it redirects instead to multisite.com/site1