Which of the three young brothers was Shaqi?

There is a detail, that is, there is a person in the movie who is stammering. The most obvious is the 7 people who killed Reynolds. After killing Reynolds' Muslim men, when he was celebrating his birthday in the restaurant, the bald head made fun of it by stammering and saying that smoking is not allowed in my house. Everyone was laughing, and one said, "Stop him smoking, Shakira." And then there's Reno. Who is this learning?
My understanding is that I am learning Shaqi, which is the Boss. In the beginning, Xia Qi first appeared in the dining table to answer the phone, reprimanded his subordinates for smoking in his own home, and then stammered just talking in the office. And Xia Qi and the policewoman were also stumped when they were talking by the swimming pool.
There were also three teenagers who put their books in their schoolbags when they were about to kill Fernandez. Even the teenager on the left stammered. So he is Xia Qi, impulsive personality. He hesitated that the boy was Ole. The young man in the middle was Renault who actually killed Fernandez.

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