^
Also, in the episode where Kouga flashbacks to when he was a kid at that "training camp" with Baron, when the Horror came and "ate" Murasaki/Purple, we see a quick flash of what looks like glowing flower petals, which the same effect that we see later in Leo's flashback when his brother shows him the teleportation spell. So yeah, it was intentional. Sigma and Murasaki are the same person.