I believe Holgs took this job and kept Satt's pro style scheme because he wanted to use this gig to eventually get an NFL OC role, a rumor that's been around for a while. Dylan was the perfect QB to do it with. In my opinion, that ship has sailed.
I believe he's now at the point of trying to not look like a shitty OC and tarnish his legacy before he retires. I think we will see a lot more of old Holgs schematically next year hence moving to a scrambling QB. I could also be flat-out wrong on this.