Stress fractures, especially, around the metatarsals are not unusual in high level athletes. Its unclear which metatarsal had the concern as there is some difference in management.
Usually when detected we look at the period within the season, chronicity of symptoms, stability then decision of surgery vs conservative is taken.
Scans can show some “delay” of full healing on radiology when in actuality full healing has occurred. In these situations, patient’s symptoms dictate a big part of the weight bearing status and clearance.
Medical personal may have seen that he was completely asymptomatic and cleared him. No way was he symptomatic + had radiological evidence of ongoing healing and they cleared him.
All in all, surgery is the way to go for high level athletes. Leads to faster healing+recovery, and less future issues