He and several others interviewed for the job after Harbaugh left. There was no agreement that he would be made HC the moment Harbaugh left.
I believe Riley was recommended by Stoops, but there was no contractual obligations to make him HC the moment Stoops left.
You are correct on Day, but Meyer knew what season would be his last, and he was only HC in waiting for 1 season. Kelly is under contract through 2024.
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