But Piper didn't fall total prey to Daniel Fuller's teaching. I did listen to Piper and Fuller on a Cassette Series discuss Calvinism. It didn't appear to be too terrible. At the same time Piper did write a book defending Justification by Faith alone to combat the NPP stuff.There is Daniel Fuller also, who was John Piper's mentor. If memory serves, he was attempting to reject both dispensationalism and covenantalism and ended up with something worse at least with regard to soteriology.