User blog comment:Shabook/Big Bads & Dragons/@comment-25940973-20151222230239/@comment-112155-20151222234120

Yes, both Garrett and Whitehall were the Heavies for their respective seasons. Whitehall was the one who turned Zabo and Jiaying into what they were.

In popular fiction, Darth Vader is the epytome of both the Dragon and the Heavy, hence the possible confusion.