i think where this went wrong because of The Ostrame,which is Maestro in disguise. and Ki forgot to update the boss to Maestro when you have to fight Maestro?
Well, that would explain why The Maestro hasn't been using tougher spells & gaining Power Pips around that time because he was going too soft on us... unusually.
Also, he doesn't even use cheats he would have in that battle for a boss of that rank like others in higher level worlds... not that there is something wrong with it or anything.
Are you referring to that final boss in the fifth & final dungeon on that event? Just asking.