User blog comment:Chicken Bond/BIONICLE's Return?/@comment-2026417-20140918151518

Just want to point this out, it looks like Pohatu's got a gear on his back. It's hard to see, but if you look, there's a yellow knob bit of one of the gears similar to what Onua has, just under the "G" in "Lego Group."

It also appears that most of the Toa will have gear functions, as Onua, Pohatu, and Tahu all share a similar large piece on their back, which must be where whatever function is going on occurs.