It's not just if it is minor or not, and whether you miss games. That's part of it. But the bigger more important part is that its a wrist injury. It wouldn't have stopped him from any skating training, or any real core training. So it just isn't reasonable to think it likely that his wrist injury caused him to skate poorly in his last slump. Debating exactly how minor his wrist injury was, when trying to figure out if it significantly affected his skating, is a waste of time. Its a moot point.
If we were talking about a knee injury, like his current injury, then for sure the severity of the injury is extremely important. But it just isn't the case when we are talking a wrist injury.