I’m of the conjoined school of thought.
While many profess a Cozy Mystery sleuth should be a single whodunnit force with only tangential help from a sidekick, I disagree… wholeheartedly.
These two characters must feed off each other. Yin and yang. Push and pull. Point and counterpoint. It is the one dynamic in the Cozy that can be trusted –by both reader and author.
Find unique, sneaky ways to bind the sleuth and sidekick together.
Make their relationship as much a mystery as the murder.