My best guess on the Evers/Fagnano thing is that Mora believes that a fully mobile Evers is his best option. He knows that Evers has some accuracy/progression issues, but feels like with more game time those will improve. Right now he knows that Evers isn't fully mobile so that part of his game is lacking, but he feels as if the investment in him now will pay dividends when he's fully healed up.
As to the notion that Mora promised Evers the starting spot and feels bound by it, I doubt it. The whole he dropped a weight on his foot thing, had his nail removed, had to play in lineman shoes, was pretty much a get out of jail free card for Mora. If he wanted to start Fagnano due to the injury of Evers, he had a built-in narrative for it.
Again, I have no strong preference between Fagnano and Evers. They each bring something to the table, and they each have their liabilities. I'm hoping for a more coherent offense against Georgia State. I would really like to avoid the slow start and then frantic catch-up thing that we've had going. A slowly building steady lead would be a nice change of pace.