IF it’s just the fibula as initially reported, that’s a non weight bearing bone. It should be fine. I would wager he’ll be training again in 6-8 weeks. IF there’s involvement in his foot then that could take longer. IF there was severe tearing of his interosseus ligament that could delay return to activity but even then we see guys with Achilles tears come back the next season.
In the past, there’s been posters more qualified than me to weigh in on his injury. Some of them might even have first person knowledge of his exact damage.

. Regardless of the injury, with surgical intervention the only thing I could see preventing his return for spring ball is a post op surgery complication such as a site infection.