I dont think we know much at all about what has gone on during the tests other than a general idea of divisions. And even then - remember those likely to get to Q3 have an entirely different approach to those not.
And I think teams like Williams or Sauber have a more complicated job because they are not likely to get out of Q2.
And the long runs - what if say Mclaren were running with enough fuel for 50 laps but instead just tried to gauge what Ferrari or Red Bull were doing and stopped at 40 laps with competitive times.
So nobody has a clue exactly what is going on and maybe Sauber will arrive in Sakhir and is one second behind or Ferrari discovers that they are no quicker than Mercedes.
I'll stick with Lewis and accept that only at Sakhir will the true order be known - and then of course just because one is quick in practice and maybe qualifying, there is no indication where any team will be at one third distance or halfway and so on. And MAYBE with ten laps left to run the smoothe drivers will now have an advantage over those who have a tendency to destroy their rear tyres.
See? We have no real idea.