My apologies - I agree - I was trying to look at alternative routes through the holes to the same end, not related to this crash, and should have had 2.
1) The pilots fail to set/verify the right take-off configuration.
2) The pilots ignore a warning.
That is with a fully serviceable a/c, taking all questions of LAE actions and MELs out of the equation. This is where the last firewall needs to be.