I'm basing my sizing on the IHSAA classification for the schools for 2022-2023 and 2023-2024: https://www.ihsaa.org/sites/default/files/documents/2022-23 2023-24 Football Alignment.pdf. I certainly agree that Harrison will likely surpass Jeff in the next classification round and so they'll both likely be in the lower 6A / upper 5A. Of course, given the numbers that you are projecting for Jeff, that still places them upper 5A or lower 6A and also puts them above McCutcheon for size.
The argument about enrollment gap in the NCC certainly is a legitimate one ... if you are Richmond, Logansport, or Marion ... but arguing about a couple hundred kids difference when Jeff and Harrison are both trolling the deep water of the IHSAA ocean seems somewhat off from Jeff's position. Realistically, Jeff and Harrison look the same, large, compared to the Logansports, Marions, Richmonds, etc. Even with the low end of the enrollment you are projecting for Jeff, it still puts them about 400-500 above Kokomo and roughly 600-900 above Richmond, Marion, and Logansport. Not to be a d*ck about things, but in the 20+ years that I've lived in this area, I've not once heard Jeff complain about enrollment gaps with McCutcheon and Harrison and how unfair it was that those two smaller schools had to compete against a 6A, upper 5A, school. I certainly can see the point of Marion and Richmond and Logansport wanting Harrison and McCutcheon out, but not Jeff. Travel's not an issue for Jeff to Harrison. Serious enrollment gap isn't an issue either. Competitive imbalance? For Harrison and Richmond and Harrison and Marion? Probably. Between Jeff and Harrison? No way.
I've been a fan of what Jeff's been able to do with the advent of the Moore seasons and into your guidance of making them competitive again. And I have ties to Jeff too as my three oldest kids all attended Jeff. I've even sent you DMs concerning my appreciation for your stances on community issues. But this is a bad look for Jeff in this "fight." Same thing with Logansport too if they were considering to jumping to the Hoosier Conference at the time of the vote. The vote should have been an abstain. Similarly with Jeff, I can't see a legitimate reason for Jeff looking at those three issues, from their own vis-a-vis with Harrison and saying, "Oh yeah, I believe every one of these wholeheartedly." Or, realistically, even one. Again, I think it's a bad look for Jeff because none of those things make any real sense for Jeff to have pulled the trigger on an affirmative vote. They didn't have to vote "no," especially if there was an amendment hanging around to make it three Lafayette-area schools instead of two, but an abstain would have been the proper thing to do, IMO, for Jeff as the reasons just don't hold any real water vis-a-vis Jeff and Harrison.