Yes the closest nodes are the data managers (also cached from that point as well). They then manage the presence and integrity of the data via the vault managers (pmid managers) who can penalise any data loses or corruption. So vault managers manage vaults and can be sure of data requests and integrity checks from the group near the data key (data managers). It all feels complex, but it does eventually tie up.
don’t worry I get pummelled with questions anyway. I am kinda used to it now