Again, the late FRA could well free up one aircraft to do a PMI or IBZ. (1600 till 2000z) And if that aircraft is a LCY nightstopper then you'll have an aircraft available from 1500z till LCY closure at 2230z.
The last E190 that is now due in OCT IIRC was there for expansion. So maybe once this aircraft is available the AMS/FRA will return. I suspect the cxd AMS to be the 8453/8454.
If above is correct then they are putting a lot of weight into these PMI/IBZ's!