I seem to recall one Sonny Bill Williams missing up to almost a season with stress fracture and other injuries that occurred around him being rushed through his recovery.
The upside to this point is, he turned out to have a pretty good career injury wise afterwards.
Isn't stress fractures a 'growing pains' situation. Suli is only 19/20 like Sonny probaby was at the time so it's proably related to him growing into his body.
Just looked this up:
Stress Fractures in Young Athletes
Competitive sports can give some young athletes an edge over their peers. When fun, teamwork, and good sportsmanship are the top goals, sports can improve young kids' physical and emotional health, self-esteem, and even their relationship skills. Unfortunately, young athletes must also compensate for still-growing bones, tendons, and muscles. Sometimes sports injuries happen.
The most common type of sports injury is an overuse injury such as a stress fracture. Overuse injuries are becoming more common in young athletes Playing sports year-round without time off doesn't give young bodies enough time to rest and recover.
How stress fractures happen
Stress fractures happen when muscles are too tired to take on the impact of exercise, and the bones absorb the added stress. When those bones become too strained, they develop a tiny break known as a stress fracture.
Most stress fractures affect the bones in the lower leg. Stress fractures are also common in the feet.
These are the most common causes of stress fractures:
Increasing the frequency or intensity of exercise too quickly
Suddenly changing the workout surface
Getting sudden and significantly more playing time
Using or wearing gear that doesn't offer enough support, such as shoes that are worn out
Insufficient periods of rest between practice or events
Stress fractures can happen during any number of sports, but they tend to be most frequent in young athletes who participate in sports that involve running and jumping, such as basketball, gymnastics, and track and field. These sports involve repetitive movements that strain the muscles and bones. This increases the risk for a stress fracture.
So based on the above and the weight of Suli I'd say it's reasonable to expect this to of occurred.
