From the details provided, it does not seem to be a problem.

Certain requirements for EB2 National Interest Waiver (NIW) cannot be fulfilled by an attorney but by the applicant himself. You can definitely...

Looks like an error if it is done without justification as mentioned in the question. It is definitely not normal.

Your question requires some clarification. There may be an option. Consult with an attorney

You may definitely ask the court about that, if it is first hearing, then it will be a Master Calendar hearing and not an individual hearing. The...

If he can wait several years, yes you can as a sibling, but there are other options available that may be on a fast track if he qualifies.

Your employer may. Depending on various factors.

There are so many options but all of them depend on your status. Personally, you cannot. If you have a qualified business, that can. All of that...

There may be a chance that you adjust your status without leaving the USA but it requires more information. Consult with an attorney about it.

From what I understand according to the information provided you cannot as you do not have any obligation with that visa too.