Do you think it is ok if I say that the PI never bothered to reply to any of my emails or met me is justification for not asking for a rec letter? I worked with everyone in the Lab, so its hard to pinpoint a specific person to write the rec letter, too, and I have 3 other PI letters. I probably won't even put the letter to the editor on my application since I was a low co-author on it anyways, and I have 3 first author pubs now and 1 co author pub.