US Immigration from Jamaica

I ve been reading through forums and I m still not clear on what to submit for the I846. I will have a joint sponsor. I m currently not working. I know we both submit the same information but this tax talk is confusing me. so the question I have is
1. Do we both submit 3 years of transcripts along with a current W2

or do we submit current year W2 along with paystubs?
2. What s the most effective way?

This is a 2 part question. My 3 cases (3 sep i130s) were sent to NVC. When I activated the cases at CEAC I only had to pay for one AOS and it had a button showing related cases . Not that I want to pay more money but I thought I had to pay a separate I864 fee for each I130 application?

2nd question. Can I use the i864ez in my circumstance? Since I am only filing and paying for 1 AOS, criteria 1c to file i864ez seems confusing:

The sponsored immigrant is the only person immigrating based on the underlying visa petition.
If I was filing 3 separate AOS then the answer is simple yes . But really not sure if that fits in my scenario.