Shared ground
Esther ends by summarizing Mordecai’s lasting significance, not by adding new plot events. The text explicitly presents him as both a high-ranking imperial official (“next to king Ahasuerus”) and as someone who remained firmly identified with his people (“Mordecai the Jew”). It also explicitly ties his reputation among Jews (“great,” “accepted by the multitude”) to what he consistently aimed to do: pursue their good and use his words to promote “peace” for those connected to him as “seed” (Esther 10:3).
Where interpretation differs (only where needed)
Two phrases carry most of the ambiguity. First, “next to the king” can be taken mainly as formal rank (the top official under the king), or more broadly as emphasizing access and real governing influence (the king’s closest working partner). Second, “peace” can be read narrowly as public security and political stability, or more broadly as overall well-being and harmonious relations.
Why the disagreement exists
The verse is a compressed summary with honor-language rather than detailed description. It does not spell out Mordecai’s job title, the scope of his authority, or exactly what “peace” looked like in practice. It also ends the book with motive and outcome language (“seeking… speaking…”) that is inherently general.
What this passage clearly contributes
This final line frames political power as being evaluated by direction and effect: Mordecai’s greatness is paired with communal acceptance, and acceptance is explained by ongoing commitment to his people’s good and by speech that fosters stability for future generations (seed). It also leaves a closing impression that diaspora life under empire can include genuine security and flourishing when leadership is both influential at court and trusted within the community.