Only Ben's decision making is injured.
Ben made a comment before the season that he was worried for the WR's because they may not get the offense that quickly. I think he was really talking about himself.
Ben's not reading the field in the manner he was with Arians. He knew that offense inside out. With Haley's, he's not scanning the field the way he used to. Before the injury he was throwing to his primary, or failing that, checkdown.
Defenses then starting playing the shallow game tight and he struggled, which is why I think he went back to the scrambling. This also explains his frustration with Haley's offense after Dallas and the insistence on using more no huddle.
The last three games he was going to his 3rd, 4th, and 5th reads, but he was taking double the time in the pocket or more to get the ball out. I know he wants to make something happen, but this offense isn't designed for that style of football and the 3 game losing streak is proof positive of that.
Ben needs more time with this offense, clearly.