For me « Elemental » is basically a mash-up of « Inside Out » and « Soul » based on the central message of « Zootopia ». Concerning its inclusion in the Pixar theory, I see some possibities (« Lightyear » is out, following its opening text.):
• Before « The Good Dinosaur », or before « Brave ».
• Between « Wall-E » and « Cars ».
• After the end of the « Cars » saga.
What are you thinking about this?