Image from SCPlaybook.com. To see their full scrimmage gallery Everything Spring practice has taught us so far seemed to point to Mark Sanchez as the starter come fall. But the first time Mitch Mustain released the ball at Sunday's scrimmage, Sanchez must have been thinking 'Oh Sh*t!' That's because Ronald Johnson, a.k.a "RoJo", was on the receiving end...busting all the way to the endzone- some 70 yards away. Mustain has the big accurate arm that the Trojans seemed to lack under Booty. There's a skill that's definitely enticing to the USC coaching staff, and one that's got to give Sanchez something to worry about. But Mustain, who completed 7 of 9 for 137 yards, didn't just give Sanchez one reason to fret. He gave him three. Each in the form of a clean touchdown including two-deep to RoJo. As Mark Saxon reported on the OCregister, Pete Carroll had this to say of Mustain's game: "Mitch can make plays," USC coach Pete Carroll said. "There's no doubt about it. He's got them in him." Yes, Mustain seemed on top of his game Sunday, ready to challenge Sanchez for the starting spot. That is until they pitched him against the strength and speed of the first team defense. Then Mustain uravelled a bit. And that's when Sanchez seemed to get the ball rolling.