A good thing to keep in mind is that the two songs Bruce merged to create "Candy's Room" are both inferior to the officially released track. And his editing of lyric and melody from song to song has been evident since the first studio material began to pop up on bootleg albums like E Ticket and Fire On The Fingertips.
It's also wise not to over-analyze Springsteen's artistic process, it starts to become tedious. This is one major problem with Heylin's books, another being his rampant ego.
There are many great songwriters who operated in the same fashion with their work. But, save someone like Bob Dylan, the amount of overall recorded material put on the shelf by these artists is far less. Which is why On The Tracks has been such a valuable resource through the years for the deep fan. His output is formidable.
Nice to have a date (9-30-1977) for the Barry Rebo video footage. Bruce turned 28 years old exactly one week earlier.