Oh well,so how could we hear his words for "Meteor Spice"? He was up in the sky in those strange floating islands. Jirou showed he could scream like hell to scare Buranchi too. Don't you think Midora can't do something similar as well or something stronger too? Maybe his "Hungry Space" extends much more than we expect or effects the space in a manner that we don't know.
Then, if the first disciple (first as well as the strongest) was the biggest obstacle but Midora proved to be even stronger and Bishokukai are enemies of either IGO and NEO, how could those words make sense if Joa said them? He/she got a new even more powerful enemy="Ok, now nothing will get in my way"…No sense at all!