blazuki
...well Hiroshi just needs to show the cultists that the scar on amon face is fake. Or he could just use cameras or some recording devices to show how amon releases tarrlok from prison using either waterbending or bloodbending. There is also the option fir Sato ti just wait quietly until amon is defeated and publicly announced as the son yakon so that he can take over the organization and whatever he wants to....there is also the fact that now that Sato is on our side he won't be put in jail and the Sato company won't have a black mark in its history. Meaning asami won't have to deal with all the season 2 troubles and be a pushover for eccentric water cinema guy. She could still make deals with vatic (was that his name?) But this time she won't be the subordinate party of the deal.