I'm not certain the concern is even just injury, but there are also concerns of a tired arm. Luis Gil has destroyed his innings coming off of TJS this year and after being the best pitcher in the AL for 15 starts, his last two he is not the same guy. I'm not sure if there is any science to building up stamina, and I don't have time to look, but it will be interesting to see going forward how these guys who are crushing their max IP after coming off injury hold up stamina wise.