They dont need an injury at all.
Hardy is going to play Cody/Taylor major minutes. He has shown he is willing to do that already.
Hardy signed a huge extension. You really think he doesnt want AJ Dybansta/Darryn Peterson/Cam Boozer? He does, but he also wants to develop the players he has through the methods he believes works. It's a balancing act. We are far from needing to panic about it. The Jazz still have the hardest remaining SOS among bad teams besides Dallas (who should easily be a better team). Sacramento has the 3rd easiest remaining schedule.
Until we see multiple teams in our range make some crazy moves to get worse, I'm extremely confident it will be fine.