1. Sure. EAD allows you to work, but advanced parole allows you to come back.
2. The law is if you return to the same job that you were doing on H-1B even though you used your advance parole you are still considered to be on H-1B.
3. I am assuming that the green card was filed by you and not your wife so the divorce has no effect on you.
4. I do not see any obvious violation of the law. I am just suspicious of that time you were on H-4/H-1 and had your own company. The only time you are completely free is when you were on H-4 EAD.
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Note: Unless the context shows otherwise, all answers here were provided by Rajiv and were compiled and reported by our editorial team from comments, blog and community calls on immigration.com. Where transcribed from audio/video, a verbatim transcript is provided. Therefore, it may not conform to the written grammatical or syntactical form.