He has been lots of places. Like most of Croom's assistants, he was a very good hire. With the notable exception of Woody McCorvey, who I thought at the moment of his hire was a poor choice for OC (though a great person and a great recruiter), Croom had excellent assistants. His hire of Ellis Johnson was obviously a coup for MSU - look how he has risen up in people's eyes. Grimes knows all the blocking schemes and will do well.