A picture is worth a thousand words because there are a thousand ways to interpret a picture.
Take a photo of me while I'm inhaling and I look thinner. If my shoulders are sloped I look weak, but when my shoulders are pulled back I look strong(er). If my arms are up high my stomach looks slim. If I'm sitting, I look like I have a belly. If you shoot a picture of me up close, my nose looks big. When I selfie, my arms look 5 feet long.
Based on those pics, Kelly could be doughy and muscleless; or, he could be fit and tight. The camera does not tell you a darn thing for sure. If Kelly hasn't been working on his strength this off-season, I'll be shocked. Whether he is stronger or not, if he hasn't been working at it he should be cut from the team. I don't know if he has what it takes, but these picures (like Sully's before him) mean nothing.