CINCINNATI — Last season should have answered any questions about Joe Mixon’s ability to be one of the NFL’s best running backs.
His fifth season with the Cincinnati Bengals was his best to date. Mixon was one of the most productive players at this position, earned his first Pro Bowl selection and even threw a touchdown pass in the Bengals’ first Super Bowl appearance in 33 years.
Yet the lingering question about Mixon’s capability as…