I was hoping my retopoed mesh would be exported back to Zbrush from 3d coat like a Goz like functionality where it automatically updates the base mesh topology after doing some retopology in 3d coat. It saves me the time to actually go into the file menu, export the retopoed mesh, and give it a filename which at times can be a bit cumbersome without having to stop and create a file. Applying the textures I had no problems with so that is not an issue for me. You can drop the reference mesh and your retopo mesh in 3d coat then why not have an option or functionality to send the retopoed mesh back to Zbrush?