Multi-family apartment ventilation

We have a mechanical ventilation system that continuously supplies OA air into each apartment. Each apartment has a fan coil unit that conditions the apartment. OA is provided into the mechanical closet where the FCU mixes it with return air and delivers it throughout the apartment from a ducted system with ceiling or high side wall register. The toilet exhaust runs continuously. The LEED reviewer feels that because the FCU cycles to maintain temperature that the bedrooms are not getting OA when the unit is cycled off. (i.e. air will be short circuited to exhaust fan). Note that OA is entering the apartment via transfer grilles from the mechanical closet when the FCU is off. GBCI wants us to change our Ez from 1 to .5 to account for when the FCU is cycled off. Our supply is not close to the exhaust and changing the EZ will double our ventilation rate. We feel that ASHRAE 62.1 - 2007, Table 6.1 only requires outside air to be supplied to the dwelling unit and not to each individual room within the dwelling unit. We feel we have met the intent of 62.1 by providing continuous OA and exhaust from the apartment. What do you think - have we complied with 62.1? Do you agree with using the ,5 Ez (building is occupied so this one change will mean the project does not become LEED certified) Only other option is to run FCU continuously which tends to over heat or over cool the apartment and make it less efficient.