It seems Burn The Witch was meant to be revealed in the Bleach series. The western Soul Society branch the witches work for was supposed be referenced in the main series not only in name but also having people with direct links to the eastern division. But Kubo called this off as he thought Bleach was already to wide.
“In a recent interview with Comic Natalie (as broken down by Arturo-Plateado on Reddit) about the release of Burn The Witch, Kubo explained that he actually had plans to reveal the Western Branch within the Bleach series but had held off because the original series was already to wide and complex to introduce an entire new wing of characters.
Noting that the Soul Society in Bleach was always referred to as the East Branch, Kubo noted how he always had the idea for a West Branch in his head but never found the right time to introduce it to the series properly. With Burn The Witch, however, it was the perfect opportunity to finally introduce the West Branch that he had always wanted to include in the original series.“

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