I didn't get this from MQD. I can't even see MQD as a non-US based Medallion. I have no MQD counter and no itemized MQD on my activity.
I got those numbers from the Base Miles divided by 5. Don't know if that's computed the same way as MQD or not.
Both MQD and base miles use the same distance based apportioning mechanism ( segment distance / trip distance times total Delta revenue). This is not the formula used for IDB.
IDB is calculated as (Y fare for Denied segment) / (sum of Y fares for all segments on ticket individually). Walkup Y fares tend to be high-ish for everything, so this helps prevent $6 fares (which i have also experienced on SEA-YVR segments after an international trip). It's a much more generous method of apportioning cost.