https://www.reddit.com/r/precure/comments/qyjswf/tropical_rouge_precure_trpc_episode_37_discussion/
Everything seems to lead into a shocking reveal concerning the Witch of Delays and the Mermaid Queen.
I strongly suspect the Mermaid Queen and the Witch of Delays are two halves of a whole. The Fool’s Casket is nothing more than the Mermaid Queen’s method of possessing Bodies.
Of course the current Body of the Witch is the Legendary Pretty Cure with her old Body missing the lazy part of herself due to the Legendary Pretty Cure sending her Yaraneeda Energies into the Fool’s Casket without realizing the Queen’s true goal.
The proactive scheming part of the Witch is still in the Queen plotting to get a younger Body: Cure La Mer…
The Memory Wipes aren’t for the Greater Good but in order to more efficiently steal Bodies after losing her Yaraneeda Half a Quarter of which which can barely hold on to the Legendary Pretty Cure’s Body and needs the other quarter of said Yaraneeda Half from the Fool’s Casket.
Eventually the Legendary Pretty Cure will gain enough strength to break free upon which the Quarter of the Yaraneeda Half of the Witch of Delays will reunite with the Mermaid Half and make a beeline for Laura to steal her Body(after Mind Wiping it).