Eren let Eliza settle her score.
As a result, the Anfang Alliance had a consistent headache for the past nine months.
Eliza could even fight and win against Sages while still being a Grandmaster Ranker. She specifically targeted the Sages from the Alliance, killing many of them during the last nine months.
Thanks to her acceptance of another soul that was Lady Zee, the behavioral restrictions Eliza had on herself due to her Sin Series Ability weren't as limiting anymore. One could say that her always-active Sin Series Ability had evolved to better accommodate another soul. She wasn't as pressed to keep her pride unsullied as she was before.
As such, Eliza could run away from the Anfang Alliance when things became difficult for her to handle. And nobody could stop her if she decided to retreat from the battles of her choosing.
