[@dirty slime]
1) umm..... how?

2) the Black Gears can't repair organic systems, they only affect technology

3) there was no control involved, the Black Gears were literally just a power boost. Devimon incorrectly assumed Gigan was going to murder all kinds of shit on his own. I've already stated that player characters cannot be mind-controlled by Devimon.

This is a reply to your post IC tho.