Your previous post seemed to indicate that you werent sure that secondaries would be sent without LOR. As for any potential interview invitees, for most applicants at most schools, an application will not be queued for review for possible II until the file is complete with LOR. Some schools for some outstanding applicants may get II without that. Additionally, applicants are not always queued and review in chronological order. High achieving "superstars," applicants from associated UG institutions, linked programs, known feeder schools, URMs, children of alumni, and others may be reviewed first.