So, Benedict 99-40 is no longer of any use to us or Calus right now. The spot is free, it's 'Hidden' and tucked away in a corner where The Crow can set up shop and stay out of plain sight from other High ranking Guardians & the remaining Vanguard. Imo, this is an ideal location for him to reside as well as slowly represent himself as a newly reformed Light Bearer. Plus old boy Drifter gets a buddy since Ada-1 left.