Can this content contribute to a solo player not playing multi-handed?
Sorry, I am not sure, if I understand your question correct. But you have to play multi handed, if you use this expansion in a solo playthrough. But I would say, it adds not so much extra complexity.
but there will be other animals follow in the upcoming expansions, which are controlled by the game and not by the player. I think this is more that what you are looking for.