mygcwaiter100,
Let's backup a little:
1. When the LC was approved, there was no person in mind, legally speaking, even if it had someone's name on it. LC is approved for a position. That is why it is transferable.
2. The I-140 matches the person with the position. That is why your degree and experience letters are important at this stage, to prove that the particular person fits the requirements of the approved LC.
3. If the I-140 is approved, then an immigrant visa has been approved for the particular person. I-485 is now a formality, and the time for BCIS to collect biographical information, make sure again that the person was never out of status, is medically admissible, admissible under provisions of exclusion due to criminal activity, etc. and the same for family members.
NOTE that ALL THIS is with regard to the FUTURE employment.
The BCIS can get suspicious if the particular person is selling shoes in the meanwhile, and can ask all sorts of questions, but will not be able to make a legal case for denial.
But, as you say, theories are theories... but that is because government officials can and do abuse the law.
As I explained to pceefan, I am not suggesting one seek out trouble. Rather, this information is meant to tell people who are already in trouble that the water may not be as hot as they have been led up to believe.
