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wudan,
1. WAC number is in sync with ND. Normally INS follows ND to process cases. It is possible that either WAC 296 or WAC 299 may get approved first. There is no guarantee that the order must be followed. There are many variables involved in processing.
2. AP, EAD, AOS (I485) are three different threads/cases. Even though now a days AP takes less time compared to EAD, AOS and EAD takes less time compared to AOS still it is possible that one may get their GreenCard but AP, EAD is not approved by then! But note that once one gets GC there is no need of AP or EAD.
Hope I answered your question(s).
Goodluck
PCee