We don't know that. He worked to get in shape during the season because he had no choice. What you're missing is he needs to become self motivated to do the work without adults on his ass to do it.
When posters talk about him not taking being a pro athlete seriously yet, thats part of what they are talking about. Being in shape when you get to camp is pretty much pro athlete 101. Its about being self motivated in the off season to put the hard work in. Guys like Risto, Girgs, Kane, Reinhart, Bogo, etc have been driven in the summer to do the work they need to to play the upcoming season.
That he worked hard with basically a gun to his head, while coaches and vets kept on him, is hardly an indication he can put the work in needed to be a pro athlete.
For an example of the exact opposite mentality, look at what Reinhart did. He was tasked by Murray and our training staff, after he was sent back to juniors, to bulk up during his season. As Murray put it, Sam has to find the time to fit it in around the work he was already doing with his junior team. Basically extra work on top of everything else he was doing. The results at the end of the year were good since Murray was very happy with the strength he added.
I haven't given up on him either nor do I think he is a problem child………. yet. He will make a lot of my concerns go away if he comes into camp in shape and ready to roll. Because that means he put the work in on his own in the offseason. Then we will know he is capable of doing it.