I get what you are saying, but was that actually because of the injury?
Looking at the details of his scoring, it seems a little strange. It wasn't like he was generally down on his scoring; he had a lot of really good nights - but also a few really poor ones. His first meeting back was a WCQR, and he scored 11 from four completed rides, plus a fall. Then he scored 9 from three, plus a fall, followed by 11 from four, and ten from five.
Then he hit a really bad spell, which included quite a few DNF's. Was that spell the result of the injury? Did he aggravate the injury? Obviously, I'm not in a position to shed any light on that, but he did appear okay on his initial return from injury.