This doesn't explain, however, some of the calculated moves the humans involved made insofar as where to place what 'debt' where - nor to explain the rationale made by the humans at Enron to enter or angage in 'new' markets such telecommunications (which, in case you haven't noticed, has taken a downturn this last year) ...
Nor does 'system testing' you allude to substitute for actual balance sheet auditing. I plain, flat, straight away don't see how you can make that statement.
Perhaps you should spend some time studying the concept of audit scope.
You must be a Wunderkind, _Jim. Is there anything on which you can't opine?