I have been working for a neurologist for the past 8 months in research at a major academic institution on the east coast. I have already submitted my app and been verified and did not get a letter of rec from him, and chose not too because he really isn't there that often, and I'm not sure he would be able to write me a strong letter. I already have a letter from my head coach and from my committee. Question would be does this look bad to not have a letter from your PI and can we even add letters after we've bee verified?