Former Dallas Cowboys running back Emmitt Smith was recently on Undeniable with Joe Buck to talk about his long career. Here are some highlights:After the Cowboys' Super Bowl wins in 1992 and 1993, Emmitt Smith thought a run at a three-peat 'was a foregone conclusion.' That was before head coach Jimmy Johnson parted ways with Dallas.Buck: What if Jimmy Johnson and Jerry Jones could have gotten along and coexisted?