I didn’t say with any QB.
2015 we not only didn’t have a QB as good as Dak or Romo but we didn’t have a RB with league leading production as Murray or Elliott. And for the record Dez was out with a broken foot part of 2015 as well.
In 2015: Dallas running offense - 5th at 4.6 yards per rush
In 2016: Dallas running offense - 3rd at 4.8 yards per rush
The reason why Zeke had the league leading production is because he got more opportunities because his QB was effective in the passing game. If Dak was the QB in 2015, the Cowboys RBs would likely have had more opportunities vs Dallas always playing from behind in 2015.
Hence, why per carry is a better indication of whether the Cowboys running offense was really that much better in 16 than 15. It was not. Even with Zeke being a better RB than anyone in 15, the rushing production was only slightly better.
And Dez was also out in 2016 -- Dallas won all those games that Dez was out though in 2016 as opposed to 2015.
Again the difference between 2015 and 2016 was QB play -- not WRs, not RBs, not coaches, not TEs...QB play.