This is how the show started off- After the Great Devourer already bit Garmadon: Pythor should've trained & fed the Great Devourer in its time, to make 'em grow. Then after Pythor SHOULD'VE un-caged the Great Devourer and it roams Ninjago City, instead, Garmadon should've battled Pythor to the death & if the Great Devourer was related to Pythor, they had each-other's blood so they both died. ;)