FRISCO, Texas — If someone would have told Dallas Cowboys coach Mike McCarthy and owner Jerry Jones before the season that the team would be 4-2 after the first six games, they would have gladly taken it. And that was with a healthy quarterback Dak Prescott and offensive tackle Tyron Smith. That the Cowboys are here at 4-2 with Prescott missing the last five games with a fractured thumb and Smith out until December after suffering an avulsion fracture two weeks before the season opener, the Cowboys are quietly over the moon with joy while breathing a collective sigh of relief. And that doesn’t…