Sorry for being redundant, but Lollygag mentioned one interesting point. Do top schools really request LOR's from all PI's? Somehow, that doesn't make much sense since I thought there's a maximum letter of 4 or 5 letters. I could be wrong, so please clarify. Thanks.
If you submit a letter packet, there is no limit to the numer of letters you can submit within the packet. I saw a packet the other day that was >17 pages!
Some adcom members are anal about seeing a LOR from every PI. Most people don't have more than 2 PIs. Other adcom members don't seem to care (in large part, it is the adcom members who are very involved in research who really care).
