This event happens after the Ruins of Warfang level if I'm not mistaken. From what I got from Ignitus' little history lesson. He was implying that only two purple dragons exist: Malefor and Gary (TLOS Spyro ).
However later in the game, Malefor reveals that there have been many purple dragons before their time. This can be proven true when Gary, Mary (TLOS Cynder ) and Malefor land on that big purple crystal somewhere in the worlds mantle.
Five dragon spirits pop up and suck Malefor into the purple crystal. So if those five dragon spirits were purple dragons then that means they were actually seven purple dragons, Gary being the seventh one.
who was seventh one?