The other party wouldn't compliment without reason, there must be a deep intention behind this.
This is using Gaven's past reputation as a shackle, binding him, preventing him from utilizing the Conqueror Army to commit evil acts in Mist Valley.
After all, the size of the Conqueror Army is there for all to see, and once they start plotting something nefarious, it would be a disaster for Mist Valley, and the commonly used mutual watch Law in the Valley cannot be applied to them.
This is because the Conqueror Army came under the banner of immigrants, with simply a little more livestock and people, Mist Valley can't unreasonably obstruct them, especially when the exemplar nation of Komeer Kingdom has already given them passage.
"The highest councilor praises overly, many things were not intentionally done by us but were forced to the corner, a desperate retaliatory attack that happened to succeed."