While I am sure there is an augment to be made that grazing is best, perennial grasses harvested for animal consumption with the manure applied back onto said l

While I am sure there is an augment to be made that grazing is best, perennial grasses harvested for animal consumption with the manure applied back onto said land, with rotation only after several years, is a close second. Having cover and cereal crops in an animal-free rotation can help, but is not nearly the same. You may be missing the sentiment of the comment by being overly concerned about the details.