Something here does not seem to add up.
4 minutes is a very long time. How can 3 highly qualified pilots persist in maintaining a stall for so long without someone figuring out that they have got it wrong.
Having 3 idiots in the office is simply not a very credible explanation, this is not a Colgan situation with a low time pilot at low level with little time to correct a mistake, we have 3 highly trained guys with plenty of time.
My guess (and it is ONLY a guess) is that they must have been getting seriously misleading information and/or some form of incapacitation may be involved.