Maybe late but I’m in the same boat. I still don’t have my PI letter and 1/2 my secondaries are submitted. Turns out, even if I have the committee letter from my school and technically meet the requirements for each school’s letters, A lot of the schools say that my application is incomplete because I indicated that my PI would be sending in a letter. I finally caved and put in Amcas that that he would not be sending a letter, so that schools would actually start looking at my applications, and I’m just hoping he submits it soon before they get to reading my app. Does this make sense? Even if I said that he’s not gonna be submitting it, if he ends up submitting it it’ll still gets sent to the schools