Giant_Hippo, 你还在么？再请问有关"cross-chargeability"

先再次谢谢你昨天的答疑解惑。我晚上又作了些关于cross-chargeability的功课，发现了以下这一段：
There is an important quirk in the cross-chargeability rule that can affect couples that do not apply for permanent residence (either adjustment of status or an immigrant visa) at the same time. If the principal applicant has the more favorable chargeability, his or her case can be filed and approved first, and the spouse with the less favorable chargeability can apply at any later point as a following-to-join derivative and still benefit from the principal\'s more favorable chargeability. However, if the principal has the less favorable chargeability, then the principal and spouse\'s cases must be adjudicated together; the derivative spouse with the more favorable chargeability cannot follow to join at a later time, as the principal needs the benefit of the derivative spouse\'s more favorable chargeability to be eligible for permanent resident status. In the context of adjustment of status in the United States, this means that the adjustment applications would have to be approved simultaneously. For cases where the spouses\' adjustment applications are not filed simultaneously, the USCIS Service Centers are usually reluctant to adjudicate the applications together.
网上也有些其他律师称主申请人（with less favorable chargeability)和其spouse (with more favorable chargeability)必须同时申请485, 否则cross-chargeability
就不适用。
这让我很担心，因为我的spouse(with more favorable chargeability)没有和我一起递485。当然，我们在我（主申请人）递485之前就已经结婚了。
Giant_Hippo, 想听听你的看法。谢谢。其他大虾们有懂这个东东的，也请不吝赐教。多谢！！