Unfortunately, your argument is made more difficult by the original narrative of Snowden's story, which claims he "broke both legs in a training accident". Were tibial stress fractures what anyone conjured up from that description?
Both sides --- Gellman and the House committee --- spun this particular issue. Both sides should have provided more context.
Personally, I also think both Gellman and the House report are litigating the dumbest, least important aspect of the Snowden events. I don't really care what kind of person Snowden is, and I don't understand what his personality has to do with public policy. I'm surprised Gellman conceded this dimension of the debate --- especially because a lot of the facts aren't really on his side, in the persuasive sense. Surely Snowden was more sympathetic when we thought he'd been in a pair of casts after a parachute mishap. The House report succeeded in re-casting this part of the story, with some assistance by Gellman.