The equation under the tax column that indicates how much prosperity change can be ignored is based on total law rather than law that is willing to work with the province owner.
Everyone has heavy tax, with average prosperity - I assume that this will change and is just a placeholder.
Regency vassalage seems to come out of RP collection before the bloodline score cap is applied.
Caelcoruinn, AERENWE has no manor holdings.
Nuoltiιm Barden has 2 different bloodline scores listed (Major 31/Minor 18).