I would say Haru, or Matoko.
This decision is not made by what we currently have, but foreknowledge of what we could have had.
Both characters were divided down into smaller people, and less than what they were suppose to be.
Matoko was the team's get away driver, while Queen was suppose to be Hifumi - the team strategist, and Haru just got shafted overall due to time restraints.
Both were hurt overall with what could have been due to rush jobs.