To who? I'm pretty sure there's somebody out there that thinks Tennessee and Mississippi State are the best two teams.. or South Carolina and Mississippi State. Point being, the SEC shouldn't create schedules off preseason rankings and assumptions.
I'm pretty sure you asked this EXACT question before last season and it was explained to you then. But perhaps you've forgotten so I'll explain it for you again.. (and if wasn't you that asked, well, here goes..)
The SEC has rotational rivals and permanent rivals, no matter the ranking. You play your permanent rival twice per year, then you play your TWO rotational rivals twice per year. The other 10 teams you play once. Tennessee's permanent rival is Vanderbilt. South Carolina's is Kentucky. Your rotational rivals "rotate" every year. A few years ago, 2014 or 2013 maybe, SC's rotational rival was Tennessee and they played twice during the regular season and once more during the SEC Tournament to equal three total times played.
Sure, this may seem dumb to you or doesn't produce the best matchups or whatever but the SEC does this regardless of ranking.. That's the formula. It works. No need to confuse it by adding arbitrary rankings based on who's considered the best team and creating unfair schedules in the process (Why should Tennessee, SC and Miss State beat up on eachother and give Auburn or LSU and easier path to the title just because those teams are "better").. This is why we have a conference tournament, the best teams, if they are in fact the best teams, always meet in the tournament.
At least with this way if you get a hard schedule you know it's because of the rotation and not because the SEC Home Office in Birmingham made it harder because you're considered a better team.
The Big 12 has a formula too, Texas and Baylor aren't playing each other 3 or 4 times arbitrarily just because they are "better"... with the Big 12 being a smaller conference they have more room to breathe as far as scheduling.. They play 18 conference games in the Big 12 (there are only 10 members, so you play the other 9 twice). If the SEC followed that scheduling formula then we'd be playing a 26 game conference schedule, basically only leaving room for the tournaments (say goodbye to those fun OOC games).
Also, from my understanding.. doesn't the AAC have permanent rivals as well. I mean, you do play USF twice per year right? It just so happens that the other best team in your conference also happens to be your permanent rival. South Carolina's permanent rival (Kentucky) is also usually pretty good, a lot of times better than USF.
So perhaps the question you now may be asking is... why aren't South Carolina and Tennessee permanent rivals. Well, because... South Carolina wasn't always the South Carolina that it is today. Perhaps nobody saw SC being this good 5 years ago and said "let's make them permanent rivals with Tennessee to guarantee that they place twice during the regular season".. Just because both teams are good now doesn't mean they will be good 5 years from now. Who decides when South Carolina is no longer good enough to be permanent rivals with Tennessee and vice versa? See, that's arbitrary and unnecessary, and why should the entire conference be dictated to in order to appease South Carolina and Tennessee. Appeasing one school is typically not how the SEC does things.
TL
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Each conference has a formula that works for them. The SEC has two rotational rivals and one permanent rival. You play your rivals twice per season. Obviously, your rotational rivals rotate every year. You play everybody else once.