What is a sufficient reason to reject a candidate for failing to meet minimum job requirements according to Labor Certification?

Yes, the candidate can be rejected if he does not meet the criterial even one.

Do i have to renounce my permanent residence?

You need to contact Canadian authority.

Does he have a chance?

After being rejected for third times, I guess it would be appropriate to hire an immigration attorney.

Length of stay is from the day you entered the US until the day you left. Since you are going for consular processing, the last day will be the day...

How can I get my immigration information to book appointment and file for my updated documents?

You may also want to work through with your wife. Ask her to cooperate with you. It would be easier.

Can I enter the US on a B1/B2 visa for a few days, leave the country, and re-enter on my new J1?

The short answer would be yes. You can enter on B visa and leave and come back on J. Make sure you follow the law.

I751 GREEN CARD

I do agree with my colleagues and say that petitioner needs 2 photos.

Why do my attorney need my wife's h1b/I-797

Your attorney is counsel of record. Ask him/her and you should get your answer.

If me and my wife get divorce, will that effect my permanent green card (( they already removed the condition last month )) ?

Since you removed the condition, you will be fine.

How much troublesome is it for the employer's to get E-verified?? Unable for OPT extension without E-Verify Number.

You may find another employer then.