回複:question to "sqgs"
An EAD allow you to change job, if you us AP to come back, and you are still working in the same company, you dont need EAD. Your stats is I-485 pending, and not H1B.
Appearantly, I-485 pending allows you to continue your current job. If you donot have a job or want to change a job, you have to use EAD.