No surprise, but the AGs investigation is starting with
1.)the gymnastics coach
2.) the Dean of the School of Ortho, and
3.) the MSU doctor and former co-worker of Nassar who apparently removed certain files at Nassar's request, and was told by Nassar of USA Gymnastics investigation of him, and didn't report this fact to MSU
Those are the three that seem most unable to escape some level of prosecution, so start there, see what they'll give up in exchange for leniency.