First of all, your kindly help is greatly appreciated. My previous questions are: "I'm going to apply EB1-EA and NIW, my friend said that it would be better if I can have my supervisor to write the cover letter for me. My questions are: 1. Is that OK that supervisor write the cover letter for a petitioner? 2. Is that better for the case getting approve?" Your anwser is YES to both of them.
My further questions are; 1. Should the supervisor act as a petioner or just a cover letter writer? 2. If he acts as a petitioner, does it mean he is the petitioner in the cover letter, the form I-140 and form I-485? 3. Would the formular of the cover letter he write more similar to that wrote as self-petitioned or that wrote by a attony? probably these look like stupid questions. Thank you for your help.