Go to the source Calvin went to

Bigger, more important then the post below is this: classical covenant - federal - theology is apostolic biblical doctrine, and it doesn't matter if Calvin presented it whole or x, y, or z theologian presented it whole. That the Word of God presents it whole is all that matters.

Reformed Christians who adopt Federal Theology can't see other aspects and elements of it that others see as well. The practical level for instance. What mainstream Christians who adopt Federal Theology mock and wave off as mysticism (or whatever).

Remember: Calvin was a bare-foot mystic compared to modern-day mainstream self-identified Calvinists.

Just as the Celtic Christians were the best and bravest evangelists and get zero notice by the mainstream church historians there are many aspects of Christian history and doctrine that go over the head of mainstream Christians.