In employment based cases where the I-485 for a dependant was filed separately and after the principal applicants case was pending for a while (such as in the case of marriage after I-485 filed but pending, and/or birth of children etc.), is the derivative applicant PD the same as the PA, or is it the date of their AOS filing? This is a big issue now with retrogression - if any of you can point me to any discussions on this subject I'd appreciate it.