That is correct. We have a Equallogic PS-6500 and use the Equallogic Multipathing plugin.
That does shed some light on the situation, but I would not say it solves the problem. I would still like to move to an Active/Active configuration.
Oddly, it seems for each volume we have we have an Active/Active/Passive situation where 2/3 of our connectors work, and 1/3 are "Not Used". (See above graphic)