Looking at previous application for reapplying?

[creepypasta13]

So I'm about to reapply to grad schools but one of my previous research advisors (I worked for him 3 years ago) will not write me LORs again. Thus, I will only have 1 LOR from a previous research advisor. I plan to get a new one from a prof I will start a research project with soon. For the 3rd, I'll have to get it either from a prof I'm currently taking a class with as a non-degree student or start another research project with a prof

One thing that's making me anxious is that if I reapply to some of the schools that I just got rejected and accepted to for this year's fall '11 admissions, then will they closely compare my SOP for fall '12 admissions with my recent SOP for fall '11 admissions? If so, will it raise a "red flag" to the admissions committee when they see that I won't mention the research project I did a few years back with the prof who won't write me LORs if I reapply? Will it raise a 'red flag' if my 3rd LOR is from that prof I plan to take a course with as a non-degree student as opposed to that prof from 3 years ago?

I thought it was better to not mention it as opposed to mentioning it and having the committee wonder why I don't have an LOR from that prof

 

[R.Mesri]

.No, there's no need to mention it. Admissions committees understand that people often don't have access to letters of recommendation from previous advisors, and they won't raise any red flags if you don't mention it. The main thing the committee will be looking for is evidence that you have done relevant research and/or coursework that has prepared you for the graduate program you are applying to, and they won't be looking for a particular number or type of letters of recommendation.