Ginnu,
Of course it is subject to whether INS buy the argument or not. All submissions to INS are subject to that. I have consistently stated that the best route is to be safe and work for the sponsoring employer for at least 180 days after the I-140 is approved AND the I-485 is submitted. I've argued this point ad nauseum for the past 2 years with people who disagree citing Sheela Murthy and the June 2001 memorandum (remember, this memo is not binding and was written by INS (not BCIS) prior to the September 11, 2001 attack. Things have changed drastically since then.
I also stated that:
I tend to be conservative when I have a choice and I would
not count the 180 period until after the I-140 is approved.
However, if I had a client that was terminated in a shorter
period, I would argue that the 180 clock started when the I-
485 was filed, whether filed concurrently or not.
I am addressing a situation where the employee (my client) has no choice and has been terminated. I would then take an aggressive approach and argue with INS that the case should be approved under the existing law. Whether INS/BCIS agrees is, as you pointed out, another matter but the alternative is to give up and start over. I just wouldn't give up unless it was clear that there is no argument and no point in going further. This is not the case and there is an argument, therefore I would make it and find out if I can convince BCIS to see the error of their ways.
Jim