It has been 98 years since Alister became the Chaos Hero and the leader of the Hero Party.
During that time, both he and the heroes progressed well in their powers. Or at least, it might seem like that Alister also progressed alongside the heroes. In reality, he was just unsealing his powers.
All of the heroes including Alister were at grand-level power. Furthermore, without having Nikui Noroi and Takahashi Ken as pig teammates, the hero party wasn't docile or easily manipulated by the Henea Kingdom and the Pope.
With Alister as the leader, he never allowed the heroes to be taken advantage of by the king and the pope. Even those "bitch" princesses who seduced the male heroes such as himself were easily slapped away like the bitch they were.
Despite slapping those princesses, the hero party was never punished by the royal family since Alister was very tough when it came to dealing with them. In his words, they either have to give in to him or kneel.