There's a pretty big elephant in the room in terms of the radical departure that the committee took somewhere along the way (it does after all consist of rotating members).
The committee used to value SoS to such an extent that even I was a bit put off by it. They started off somewhat reasonable, undefeated Iowa behind two one loss teams. Undefeated FSU behind two one loss teams. This was an SoS, data driven argument.
Then they put two loss Auburn over two one loss teams, and also over an undefeated team. People got so caught up in the moment they lost track of how big a reach that was, and it wasn't helped when Auburn ended up with 4 losses. If you compare what they did with Auburn in 2017 to what they did just now, it's nothing in comparison. At the same time though, the committee didn't even put an undefeated UCF in the top 10, despite a relatively respectable SoS.
Then somewhere along the lines they flipped things, to a bit of an extreme on the other end, this time Cincinnati gets in and gets spanked by Alabama. Cincinnati's SoS was basically the same as UCF's in 2017 (71 vs 72). They are playing in the same exact conference! They are both undefeated, and what are the rankings? Cincinnati is 4 and UCF is 12!
You can look at the schedule and rationalize things and try to explain how you got there, but you can't give Cincinnati that much respect for basically one single game, while UCF is ranked behind two and three loss teams (the BCS had UCF at 9). It was remarkable hubris by the committee and it's kind of how we got here. The committee now feels like they can just do what ever they want, when they want.
SoS matters, sometimes. Head to head matters, sometimes. Conference matters, sometimes. Injuries matter, sometimes.They are remarkably inconsistent and they're not very reasonable because they can obsess over one particular detail. I think Alabama belongs in, I've made the case the entire time, but it's driven by SoS not by some weird injury criteria.