They are certainly saying all the right stuff about Ewers. I see the sides to both arguments, but I think you play him if he feels good and the medical staff gives the thumbs up. If he was truly practicing today, even if it was in a limited capacity, that tells me he is pretty far along from when the injury occurred. I doubt they would let him do much, if any, rotational work if they were concerned about aggravating the abdomen/oblique.
I am not a big fan of holding guys out who would be playing if it was a "bigger game". You are also talking about a guy who has now missed a game for the 3rd straight season and I think there is some value in him showing he can rebound quickly. The re-injury risk is a concern, but there are a million things injury-related that could happen in a football game that could be bad for him and are just as likely to happen against OU as against Mississippi State. If the trainers feel like it is healed, he can't get "extra healed".
Of course, it would be great if he was only needed for 2.5 quarters if he does play.