Petro did a lot here beyond being a D coordinator, guy is a hell of a recruiter, he will be missed there the most. That said this was never ever going to be long term hire unless Dom ended up here and even then I wasn't totally convinced. I figured 2-4 years at most so this should be no surprise to anyone. The majo downsides are his presence on the recruiting trail and the fact that this would have been year 3 in a complex system that takes time to run.
Like I said though he was never gonna be here for the long haul and there are major questions about his system being able to work against the top end in this current landscape.