Board Thread:Theories and Rumors/@comment-30938718-20180317102920/@comment-29670051-20180613134933

Nya probably remembers him and recruits him with when they are creating the resistance.

And even if the Sons of Garmadon did block all entrances and exits, that doesn't mean that the Ninja can't get out for recruiting another ally or possibly to draw the Sons of Garmadon off of Ninjago.

Also Echo Zane isn't a good enough fighter to be Mr. E. It makes for more sense for Mr.E to be a reprogrammed Borg nindroid.