+1 for adding Jon to core security. It will be a valuable addition and being PTL, I feel his presence is important to orchestrate the security discussions.
Regarding the cores being removed, I agree with Brian that they haven't been active for the past couple of cycles and it is important to keep the core security group small.
Not to forget, the members are still Cinder cores and we would be happy to get their feedback on any security issue if required.
Thanks for all your contributions Ivan, Walt and Sean!
+1 to both proposals