... done, Arie.

Argument:

(The argument is based on the assumption, that what we are told here about the nature of the fraud - among other things that it was a creditcardfraud - is true)

1) If the whole point of recovering the data from these disks is to track down the perpetraitors of this creditcard insiderfraud, this must clearly be deemed a viable way of tracking the perpetraitors.

2) If the data had been recovered just after the attacks, one must assume, that it would have been easy to track the perpetraitiors almost immediately.

3) One must also assume, that the perpetraitors would have known this.

4) If the above is true, then it must have been part of the plan that the towers would collapse and destroy - or significantly delay the recovery of - the data that could be used to track the location (physical and/or cyberlocation) of the insidertraders.

5) But it could NOT have been expected with any real certainty, that the towers - both towers - would collapse completely to the ground by the effects of a plane hitting them.

6) Conclusion: This means, that the perpetraitors had a real certainty, that the towers would come down, and they (or the ones who facilitated the attacks and gave information to the insidertraders that they could/should make certain transactions) must have made ingeneering arrangements in the towers to facilitate their total destruction.

[An aside: My speculation, pure speculation, runs on the lines of thermite to weaken and/or cut many/all essential beams and then detonate thermobaric bombs to destroy the towers. Thermobaric bombs have certain advantages, among others that not many of them are needed and that they work extremely well as 'cavebusters' - and the WTC towers' floors were sealed spaces]

Not just an 'innernet' rumour.