Falling awkwardly from a simple innocuous aerial challenge and ending up with a season-ending injury is absolutely something for the S&C coaches to look at, particularly when it's one of a number of serious injuries emerging for innocuous circumstances.
In isolation you'd say it was bad luck, but you still analyse it, and when you consider how big Diego is, his muscle mass, his lack of similar injuries in the past - an injury incurred that way is ALL about conditioning.
Not to mention, as Zatman said, our physios then came on and stretched his leg out, making a bad situation worse
Backroom staff needs looked at, badly.