"Holds queue", "Holds to pull", "Holds awaiting pickup", and probably "Hold ratios" (can't test in KTD) do not honour Library Groups feature "Is local hold group". They show holds for other libraries, they show holds for patrons from other libraries, etc.
Actually, it looks like "Holds queue" will say "A patron from library X". I think it's still suboptimal seeing that at all though. The "Holds to pull" shows the patron name though. "Holds awaiting pickup" also shows the patron name and cardnumber for all libraries. "Hold ratios" doesn't work in KTD, but at a glance at a non-KTD system... it looks like there's probably not personal information showed in that report, but that it does show information for other libraries.
In the meantime, it looks like IndependentBranches will do what we need, but really Library Groups should also hook into that mechanism...