You are absolutely right Fletch - for the most part.  The corn kernel has a cellulose hull that makes the feed product unsuitable for hogs.  Removing this hull and making cellulosic ethanol from it like Quad County Energy and others increases fuel production by about 8% with a low CAPEX while also increasing the market for the feed portion.  The cap on 'corn ethanol' in the RFS needs to be increased or done away with completely as the world is awash in grains.  The stover should not be left on the ground however as that requires plowing to manage it.  Taking about 1/4 allows the good practice of no till planting.  Using the hull will result in about 1.3 billion gallons of cellulosic ethanol and is the next step rather than trying to process the stover.  Utilizing the waste CO2 by adding H2 produced by electrolysis from the plentiful wind power in the corn belt should be the next step. Using the stover to directly produce energy for the refinery is probably its best use at this time.