Seattle Police Department commanders have recommended possible termination for a union official who downplayed the death of a young woman struck and killed by a fellow officer last January, agreeing with the department’s civilian watchdog that the union leader acted unprofessionally. The commanders issued a blistering disciplinary recommendation to police Chief Adrian Diaz on Friday, sweeping aside excuses that Officer Daniel Auderer’s comments about the death of 23-year-old graduate student Jaahnavi Kandula were private or police union business. “Even crediting your explanation as true, that …