Perhaps, or maybe a son’s efforts to get some credit for his dead father. And it’s not the first time for Led Zep. Just ask Jake Holmes... He had to go to court, also, to get the credit due.
7 Songs That Led Zeppelin Ripped Off : Exclusives : Music Times
Yes, Zep, like all other artists, have "borrowed" parts of others compositions.
This case, to me, is a non-starter. Except for that first appregiated part the songs are drastically different. We'll see how the jury feels.