Board Thread:Legitimate Canon Questions/@comment-25178327-20140116033806/@comment-16072563-20140116175750

The eyes got bigger as well. If you look at Kali's and Enis' eyes, You'd see that the red glow  covers up their entire eyeball with no white, while Scott's and Derek's alpha eyes look like a normal sized eyeball. The more of the pack they kill, the more powerful they get. The more powerful means a brighter spark.