A reference letter question about EB1-OR employment-based applic

My lawyer said no reference letter should be from my company since my case is EB1B-outstanding researcher, employment based. People from my company are not independent, could be benefited from my application. But without the letter from my company, how could convince USCIS that I am an outstanding researcher in this field and how to reflect this is an employment based application? Is my lawyer right? I heard only 2-4 independent letters will be fine and I need to make sure that I have letters from my company, which is quite different from my lawyer told me.

Can someone comment on this? Or any link useful I can show to my lawyer?

Thanks a lot!!