Leaving after biometrics should not impact the subsequent entry on visa.

You can use the Avvo search tool for guidance.

Yes they may do so if they are otherwise eligible for visitor visa.

Best to have an attorney assist you with answering this.

Contact USCIS directly for explanation.

Answer the question truthfully but consult with an attorney for review of travel history to understand impact.

File the correct form (I751) right away.

I agree with my colleague as EAD processing is very delayed.

No need to apply for extension with AOS pending.

Yes if valid and you establish short term entry.