It's not about Gus Edwards being a great player. It's that there's very little returning experience besides Mark Walton. Are you willing to risk having Homer or a true freshman knowing all the pass protections if Walton goes down? It's no big deal for a freshman to come in and take a few carries but learning the entire offense isn't always a breeze.
You dont need experince at rb. The easiest position to transition to at any level.
For the third time in this thread, it's not about running ability, it's the other responsibilities. If Walton goes down and Gus transfers are you comfortable with a true freshman's ability to master all aspects of playing running back? It's not just taking a handoff and running. There's pass protection and route running. There's play audibles and protection audibles. The reason why Homer rarely saw the field on offense last year wasn't because the coaches thought Yearby and Edwards were more talented, it's because they trusted them to not f-up if Kaaya changed the play or the protection. If by midway point next season, one of the freshman has mastered the playbook and Gus gets relegated to fourth string, so be it. I'm just not going to assume a kid is going to come in and be ready to play full time right off the back.