Why does Mr. Benedict choose these specific children for his mission?

Mr. Benedict chooses these specific children for his mission because he recognizes their potential and unique abilities, which are essential in countering Mr. Curtain's nefarious plans. Each child possesses distinct skills and talents that contribute to the group dynamic and make them capable of tackling the challenges they will face. For example, Reynie has exceptional critical thinking abilities, Sticky excels in knowledge retention, Kate is resourceful and physically adept, and Constance, though initially underestimated, brings unique insights and determination to the team. Mr. Benedict's keen awareness of these qualities allows him to assemble a group that is not only talented but also complementary in their strengths, which is crucial for successfully executing their mission against the wider scheme of mind control orchestrated by Mr. Curtain.