Dagobah was always meant to be less the place where Yoda was hiding, and more the place where Luke discovered his true identity and found “rebirth”. Luke crashed into this swampy womb and discovered Yoda, a helper that guided him through the process and then was discarded when his function was complete. Yoda was Luke’s placenta, in a way. The trials of Jedi strength are contractions of labor as Luke is reborn as a new man. And now you see the added meaning of his failure at “the cave”, the cave is clearly the birth canal where only he and his father had ever been (and his sister of course). He must confront this fact. His “failure at the cave” represents his failed first birth, as he essentially circumcises his father by cutting off his head, and finds that without his foreskin they are actually equals. So in leaving the cave he is “reborn” as a new creature, with a new intact foreskin of Jedi power.

It’s all right there guys. The greatest twist in the Star Wars prequels, or any of the films for that matter, was the revelation that Dagobah was Padme’s vagina.