User blog comment:Chicken Bond/BIONICLE's Return?/@comment-876769-20140714064927/@comment-4767722-20140714085948

I think the dropping of the term "Toa" and replacing it with "Master" is a result of trying to draw younger buyers. Sort of like how they simply call the good guys of Hero Factory "Heroes". However, considering there are "Defenders" there's a possibility that the sets with the original Toa Mata/Nuva's names are villains or mentors.