Board Thread:Theories and Rumors/@comment-30938718-20180317102920/@comment-4013721-20180609155613

XxAkumuxX wrote: Why would Echo want Garmadon back? The SOG would make a new nindroid or corrupt an already existing good shape one. You have to remember that Echo Zane was never brought back or mentioned after Skybound, so he could most likely have been found by Harumi, instead of Jay and Nya.

and given how she manipulated Lloyd and the Ninja, she could have tricked Echo Zane into disliking the Ninja. If that didn't work she most likely had him reprogramed.

And let's keep in mind, that Nindroids does not seem to be a common type of robot that one could purchase from Borg Industries or something, or else we would see them being used more in the show, rather than just the security of the Hiroshi Labyrinth Stronghold.