Wagner 'mainly' wrote the work 'backwards'? Oh no he didn't. I assume the claim that Alberich is (apparently) left standing at the end because Wagner forgot about him is intended to be amusing; there is, I suppose, no accounting for taste in humour. It surely cannot be intended seriously, given that Alberich in any case appears in Götterdämmerung.
However, most bewildering is this:
He [Alberich] has a brother called Mime, who is easily the most boring character in the Ring Cycle (Das Rheingold is followed in the sequence by Die Walküre, Siegfried and Götterdämmerung). Whenever Mime appears, take a toilet break.Leave aside the inelegant language; leave aside the lack of italics, etc. Mime is 'easily the most boring character' in the Ring cycle? The character whose little, almost Schubert-like paean to old Nibelheim makes us realise what has been lost through Alberich's capitalisation? The character through whom Wagner's dramatic genius makes us feel the great misery of something akin to quotidian existence? The character who thereby actually becomes a credible focus for our sympathy, despite the very real evil of his proto-Nietzschean will to power? I can just about understand almost any reaction to Mime, but 'boring'? Surely one would simply have to hate Wagner to think so; in which case, might it not be better to desist from writing a Wagner A-Z? Perhaps once again, this is meant somehow to be amusing and/or ironic; I cannot imagine how or why.