I don't think it was the injury but rather a lackluster win against a bad Louisville team.
SoS caught up to them as well. The committee ignored SoS up until now, but they had a very weak SoS and that is actually something the committee should consider.
Basically when it came down to discussions in the room, FSU had an injury, that's criteria. They had weak SoS, that's criteria. They just didn't have enough to get them across the line, but the committee should have moved them down sooner...
Edit: Having said all that, but I feel really bad for them. That's a terrible position to be in. I'd hate it if Alabama was in the same position, I'd be mad. But! Alabama would never have an SoS of 62.