I didn't think Wynn earned a roster spot due to his play in the preseason (or lack there of). He made the roster because of Morency, B-Jack, and Herron's injuries. But he has certainly come on since then.
His play in the last two games has not only justified his roster spot, but enabled him to push Morency and B-Jack for the starting job.
Actually, Wynn earned his roster spot by his good early impression before going down to injury.
He sealed the deal by working extremely hard with the training staff to get back as soon as possible. He also impressed the coaching staff with his tireless work in the classroom and film room while physically unable to practice. He asked great questions and showed a maturity that he did not show at Florida.
White, who worked hard and impressed many never had a chance as long as Wynn -- who has great RB raw skills including: great size/speed ratio, low center of gravity at 5-10 232 and almost no body fat, great vision, and football instincts -- showed up and worked hard and kept his head on football.
Wynn was the top running back coming out of HS and possesses upside like no one on the Packers roster. He needs to keep working, but is off to a great start.