That is very myopic statement. Adding Miller and Zack should have helped them. But both Miller and Zack were below career norms and the Dbags had some crucial injuries and under performance from other offensive players. To say everyone knew the dbags were going to be bad is completely false. I am not pardoning them for that trade. But that team should have contended for a wild card at least.
Actually a lot of statheads knew they werent going to be as good as they thought. Now nobody thought they would be as bad as they were but the Dbacks incorrectly thought their team was as good as it was in 20015 and tried to build off of that when in reality that 2015 team over performed. They started at the wrong base line so even if they did stay healthy and Miller didn't suck they would have been meh instead of bad.