Not the first author

I am not the first author of some of my publications, will the officer reviewing the petition take this as a downside?

to Melvin:

I'm not the first author of any of my publications, and I got an RFE. Not sure if it was the reason, though. And my I-140 got approved in the end. Just FYI.

to Melvin:

Hey, I don't think it's a big deal if you are not the first author to your publications. From what I have known, the strength of overall credentials is what really matters. You still might want to verify this though.