Stuby1
I agree. What I meant is that the MDA of a NP might be higher than the MDA based on the obstacles in the circling area. For example a NP based on a VOR that is not on the field in combination with a low intensity approach light system.
This might explain why the circling via an ILS on 27 might bring you down to an MDA based on obstacles within the circling area while the VOR on 09 is not able to bring you down to the same MDA as the ILS.
I am just trying to figure out where the original question is based on.