According to BS01, members of the Brutaka species increase their power with Antidermis. Brutaka in particular was “fed” by the Piraka in Voya Nui with Teridax’s antidermis. Could it be that Brutaka’s descent into darkness during the 2006 arc was caused by absorbing the malignant Teridax’s essence, and his recovery caused by his abstinence of Makuta’s antidermis while he was a Barraki prisoner? If so, could Brutaka be an allegory to drug or alcohol addiction?
Additionally, we know that Teridax could see beyond the green vat as he recognized Matoro when he entered the Piraka stronghold, if that’s the case, he surely recognized Brutaka when he fought him in Mahri Nui, but it seemed like he didn’t know the powerful guy that was eating him alive. Was there a reason Teridax didn’t want Brutaka to know all the antidermis he absorbed was he? Could it be that Teridax was planning on slowly possessing Brutaka’s body?
Then again, another theory comes to mind. What happened to the rest of Brutaka species? Could it be that the Brotherhood convinced them to join their army in exchange for an unlimited supply of antidermis?