Then why gods then told elementals follow what exalts command them to do despite it is willpower+essence contest :P. Also why elementals are more willy lot compared to demons? Also I got look that you can command demon to do kamikaze action while actually summoned elemental can refuse or resist said command (besides heaven getting angry for abusing elemental). Also in jokun it mentions specifically it asks<em>lot of convincing</em>to ask them to get their feet off the ground. Also both ifrit and jokun has part that if person who summons them is dishonorable or not 'worthy' they refuse serve them (despite summon succeed) or they will be upset or something.