There aren't necessarily rounds of LOA's being issued.....if the academy thinks a candidate is deserving of a LOA, they send one out. Your chances are 50/50 just like everyone else who applies. I wouldn't associate your former squad members LOA with attending SLE. There is a very high percentage of people who attended SLE that will be denied admissions. Just keep working hard and let the chips fall. There are too many things that you can't predict in this process so control the things you can control.