Just to be clear, I don't think the study got into value judgements of "overweight" or not. That's a medical decision to make, and BMI no doubt is one of several factors going into that. If the league as a whole skews to high BMI, that probably only highlights that BMI alone is not a strong indicator of health or fitness. Muscle weighs more than fat, yadda yadda yadda. This study used BMI as one of several metrics, and it happened to be one that turned out to have a positive correlation to the particular injury. But, if (say) having tree-trunk thighs is somehow causing a throwing mechanical issue that manifests in the elbow, it's worth knowing, value judgements aside. Everybody knows that pitching is greatly about the legs, but perhaps there is the risk of having too much of a good thing. (That's not a conclusion the study drew, I'm just throwing it out there as the kind of thing that I imagine teams will look at.) Come to think of it, a certain third-baseman of our acquaintance has muscular thighs, and he managed to blow out his elbow a few seasons ago. Just sayin'. (OTOH Alex Kirilloff had elbow surgery, and his build is more normal.)