Hughes will be just fine. Sure, he will never be a behemoth around the crease and he will always have as his weakness to defend, especially against bigger players moving in on him. He has to work on his positioning, agility and stick work to try to diminish that. Gaining more muscles isn't the answer, although more strength is always a good choice. It's not the same thing. But, he's the epitome of a modern defenseman. He will create more goals than he will cause at the end of the day and he will cause more pucks to be and stay in the offensive zone than the other way around. It's also the most difficult position to learn and hone in the game. Give him some time. Sure, he's struggling defensively, but he's also showing how much he can contribute in all other areas of the game. Pettersson and Hughes are the most talented and promising players on the roster (thank you Captain Obvious!).