I read somewhere that in 1977 when times were on the stage where Pagey, to interpret a song did not remember well the notes, Plant asked how this song? Plant sang it, and finally something was interpreted. This according to a person who was on tour with them.
This person also commented that the world around the band was quite dark and airtight. He was not allowed to approach the band did not even talk to them, unless it was allowed, no cross words, and do not ask anything other than music.
As someone said here, Pagey not again be the same, time and beyond that, the drugs consumed his talent.
The best part is that this time he is standing, looks much better and I think it has much to do.