Why not just use we cordovan care cream?
Reviews on that cream are not that good esp. in the SF community.
However, my purpose for the Leather Defender is to waterproof the shell as much as possible. I avoid wearing shell when we are having rain in the forecast. However, you can get water sprinkles during surprise showers and in public toilets etc.
I'm confident that the Macmethod is all you need to get the best shine on your shell shoes.