Thoughtful post. You bring up two issues. First, nobody said all reps that are let go are like termites. When they become like termites they have to go. That is true of any organization or team effort. Raising concerns or suggesting alternative approaches does not in and of itself constitute a negative attitude. Far from. It demonstrates engagement. Approach matters, though. Your post demonstrates your recognition of that concept. The best way to be treated with respect is to be respectful. It is no guarantee, but it usually works that way.
Your concern is about the manipulation of numbers in a dishonest way. There are two parts to answering your question. First is the disconnect between your numbers and your counterparts. That can happen when there isn't exact mirroring of zip codes or accounts. It can also happen based on variations in weighting factors applied to managed care plans, or differences in goal calculation methods, or even differences in the way refills are handled. Different companies may take different approaches to measuring performance.
As for singling out certain representatives, that would never happen. Not because it could not be done, but because it would be counterproductive to evaluating overall performance. If territory numbers are altered, it means the district numbers would be impacted as well, and that would roll up to the region and nation. Nobody has time for that. Besides, what happens when reps change in the middle of a measurement period? Manipulating territory level data for one period would skew the territory performance for the next period. Compound that scenario for the entire sales team and the system would break down quickly.
Analysts see territories as individual components of districts, and districts as components of regions, and regions as components of the nation. They see a territory as a number, not as a person. DMs rarely have input in the process in any company, but they should know better than to suggest performance measurement is personal. It isn't.
It is never a good feeling to be down in the numbers, but plenty of well respected and well liked reps have been there. The best thing to do is understand your business and control what you can control. Same goes when you are on top, by the way. In our business, the more reps we have doing their best, the more opportunities we have to do this job. Every single rep makes a difference. Welcome to any applicant who knows this.