Maggot driver.
I'm with you on this one.
We'll have to wait for the report.
However, I'm concerned as to how a two pilot airliner could be 1000ft lower than it suppose to be. If there's no issues as to why it was 1000ft low. Then could the same errors lead to another aircraft being 2000ft low?
On face value an error has allegedly occurred.
I'm more concerned with the operational environment that has allowed errors to occur on a repitive basis.