I just heard that due to very understandable reasons one of my recommenders might not be able to submit his recommendation to every target school in time. His letter should be very strong, however, and I really don't have time to get another one now, so is it absolutely fatal not to have three?
I mean, will two LOR's mean automatic fail, without regard to the application itself? Thus, should I just get some random prof to write a short mediocre letter just for the sake of getting my application read? The two remaining letters are strong and discuss my research to a good detail, and the "problematic" recommender said he should be able to submit the letter to most places. I will obviously do some prioritization with regards to where he should submit the letters, but I'm wondering with what to do with the remaining ones.