In the chaotic aftermath of last Wednesday’s mass shooting near Lake Merritt, the Oakland Police Department overcounted the number of gunshot victims associated with the incident. The reason, a separate and nearly simultaneous double shooting. Initial reports said there were 15 gunshot victims who were transported to the hospital from the Lake Merritt area. But police have since determined that one of those victims was wounded less than 30 minutes later in a double shooting in the Bella Vista neighborhood. In that turbulent evening, 16 people were shot in the city.  Police said Tuesday that two arrests have been made in the double shooting, but it has now been nearly a week without an arrest in the mass shooting near Lake Merritt. After a night of almost unprecedented violence in Oakland, Mayor Sheng Thao had been noticeably silent. The morning after the mass shooting, her home was raided by the FBI. Thao kept out of the public eye for four days, …