User blog comment:B214/Talk About What You Want! 2/@comment-208.54.44.248-20140814204415/@comment-24502975-20140821233929

Saji already has all of Vritra's SGs fused with his own. There were only 3 others to begin with, I think some of us just assumed his soul was split into more pieces.

Anyway, Vritra is considered as both a Dragon King and an Evil Dragon, but I think the 'evil' part is because his power represents darkness in a way (not the same darkness as Gasper Balor).