How high would you estimate my chance to obtain a § 212 (d)(3) waiver?

I agree with my colleagues. Contact a US immigration attorney for assistance.

Will this affect my H1B? Only COS or approval as well?

I agree with my colleague. Contact the company's US immigration attorney prior to leaving the US.

I-485 intend to deny...Filing I-601

I agree with my colleague. Contact a US immigration attorney to assist with filing the response to the NOID.

whether the workers on 1099 can be counted as current no. of employees 1+6=7 for filing I-129 form purpose.

Contact the company's US immigration or employment/tax attorney to review the specifics.

Should I cancel my re-entry permit or let it expire? Are there benefits to canceling like accruing time toward naturalization?

I agree with my colleagues. There is no reason to cancel the permit.

I agree with my colleagues. Contact a US immigration attorney for assistance.

I agree with my colleague. Contact your company's US immigration attorney.

Can I sponsor my husband based on his earnings, as well as our savings and current assets?

I agree with my colleagues. Find a US based joint sponsor and contact a US immigration attorney for assistance.

I agree with my colleague. The I134 is not enforceable like the I864. Contact a US immigration attorney for review.

I've signed the Affidavit of Support ( I-134) for my bothers's son, His B1/B2 visa issued.

I agree with my colleague and this is not a question, this is a statement.