I have no clue why Mingo would sign with Ole Miss unless he has been a life long fan. They have no offensive coordinator, their QB depth chart is bad, Luke is probably not going to be their coach in 1 or 2 years, they completely whiffed on all of the top recruits they targeted, and they are going to be a really bad football team the next couple of years at a minimum.
At MSU, we didn't throw a ton last year, but JoMo wants to throw the ball more and he wants big plays. Mingo is a big play receiver. Our WR coach was a WR coach in the NFL for Green Bay so he knows what it takes to be a pro. His best friend Jarrian Jones signed with MSU. Again, kids make bad decisions all the time in recruiting, but flipping to MSU seems like a no-brainer if I am Mingo or his family.