High-ranking Oakland police officers are not being held accountable for crimes committed in the areas they oversee, a report by a former Los Angeles police chief found. A consulting group led by the former chief, William J. Bratton, recommended that the department patrol the city in five districts, with each led by a captain. Burglaries, in particular, were not being properly investigated, with one part-time investigator assigned to 10,000 complaints last year, Mr. Bratton’s group said. The report was issued on Thursday, a week after a court-appointed overseer criticized police leadership and a day after Chief Howard Jordan quit citing health issues. Mayor Jean Quan disputed that burglaries were not being investigated.