Since Shiryu is a former Impel Down warden, and new members of BB pirates are locked in ID since long ago already. Do you think there is a member that actually holds a grudge to Shiryu because of what he did when he was still a warden?
What you think doc q devil fruit will have ? I am guessing mythical zoan grim reaper form. Another guess virus control paramecia. Doc Q can control the any virus and literally hack your body to nerf you. Like bio weapon, image controlling flesh eating diseases and use on enemies.