Not a doctor, so...what makes brittle bones so much better a risk than soft tissue?
Does he have brittle bones? He had a stress fracture, which is actually common. It didn't heal, which is odd but sometimes they don't. He had an impact injury that resulted in his fibula breaking, probably would have had a Tyler Lockett sort of injury if he did not have his tibia previously repaired
Mariota and Carr had the same broken bone last year... no one is talking about them having brittle bones
Brittle bone diseases, or conditions that would result in a more brittle bone, are highly unlikely in this case because he wouldn't have made it to the NFL or even been able to play athletics in general. So we can cross that off the list.
What can happen, in people who use steroids/steroid agents, is you can develop more fractures of bones and strains/tears of soft tissue. I think it's reasonable to say that's probably more likely than some bone disease or condition. However I wouldn't go as far as to say that he has used steroids in his past. I'm a cynical guy when it comes to professional athletes and steroid use. According to an artcile in 2013 from SBNation, it was estimated about 10-15 players on each team (back then) were using HGH and about 20-30 percent were using a banned substance. So I suppose it's possible. But I won't get into tossing out ridiculous accusations without any evidence whatsoever.
What is the most likely scenario is he had a stress fracture from mini camp, doing a lot more rigorous activities than he's used to, it never healed for whatever reason. Then, coincidentally, he had an impact injury to the same leg that resulted in a fracture of the bone.
I'd say he just has bad luck.
I have no stock in White. I don't care if he does well or not. I actually don't even have an opinion on his outlook yet. It just irks me when people stay at a Holiday Inn Express and make claims about someone's health/recovery/injuries when really the facts and science don't back up their claims. It's these moments I think someone with a background is great to have in your back pocket or on a forum somewhere to set the record straight to some extent.