Are there any people left who fully understand Manhattan* from top to bottom? If not, they already have a short- to longterm problem unless they find something

Are there any people left who fully understand Manhattan* from top to bottom? If not, they already have a short- to longterm problem unless they find something in the OSS community with the same characteristics. *) https://blog.twitter.com/engineering/en_us/a/2014/manhattan-our-real-time-multi-tenant-distributed-database-for-twitter-scale https://blog.twitter.com/engineering/en_us/a/2014/manhattan-...