I think the Nats (and by "the Nats" I mean Riggleman) are saying that because all their prior tests reported no structural arm damage, and then, BAM! TJ surgery. I doubt that Riggleman is really giving a qualified medical opinion on the subject. However, since Strasburg's new UCL is made from a thicker, tougher tendon, it is extremely unlikely that he breaks it again even if exactly the same motion is utilized. Personally I see no reason for him not to continue using his changeup as he was as long as it is an effective pitch for him. Using a lot of offspeed pitches doesn't make you a junkballer, it just means your offspeed pitches are really, really good. No reason to go away from that just because you have a 100 mph fastball.