Michael will be 2nd string. While Turbin runs into tackles, this kid spins out of them. Turbin will probably transform into more of a 3rd down recieving back. I give Turbin a lot of cradit in that role though. Turbin has a knack of finding that 1st down marker and sprinting to it and getting just enough to move the chains. Plus when Turbins in, you still have to account for him as a runner on 3rd and long. Turbin is also above average in pass pro.
Watching Michael you can see he is clearly the better runner though. He reads his blocks quicker, fast and decisive on his cuts, and his spin move and tackle breaking ability is superior to Turbin. Its no surprise why Schneider wanted this guy with his 1st pick. He is an athletic freak. His 40 is good (not elite but NFL standards good), but its about his verticle and other stuff that makes this kid an amazing athlete. Upper body strength, etc.
I've talked to some A&M people and his whole deal with Sumlin was way over blown and frankly this kid excelled in the pro offense before Sumlin came in with his spread. An A&M guy told me he has the NCAA record for rushing yards in a game but I didn't bother verifying it.