Are There Actually Five Letters in 2 Corinthians (so that it is 2, 3, 4, 5, and 6 Corinthians?)

In my previous post I tried to show why most critical scholars think that the letter of 2 Corinthians is actually two different letters that have been spliced together.  When I was back in graduate school, I learned – to my surprise – that there were scholars who thought that in fact 2 Corinthians was [...]