A few things...
1) I think he needs to get more efficient in his breakouts. He is so dynamic - but he gets away with things at the college level. He's always looking to either move the puck with his feet or make a creative stretch pass. He can do this at the college level consistently, but can get caught moving side to side or even backwards trying to make the perfect play. He's going to need to learn that he can't always get away with this at the next level. Sometimes, he's going to have to settle for a shorter, quicker pass or even chipping pucks out - and moving forward. This is, perhaps, the biggest reason I think he needs to go now. Not that it is a real problem or that he cannot learn quickly at the next level - I just think its important for his development to be pushed to improve and speed up (rather than stagnate and/or develop bad habits in a league he's simply outgrown)...
2) He can be more physical against the wall and in front of the net. Gildon is a big boy, but he doesn't always use his size to his advantage. He needs to get better at pinning his man and clearing the front of the net. He is often looking to collect the puck with his stick and move it - rather than just eliminating guys and letting his teammates move the puck. Part of that may be UNH's designed over-reliance on Gildon to skate or move pucks out of the zone...
3) He can get better away from the puck and with his coverage in his own end. It is his defensive game that needs the most development, obviously, including picking up loose forwards in his own end and positioning himself. He has the talent in his feet and the strength to be a steady defender. He'll need to be worked with to develop that game, however - and hopefully your AHL affiliate can do so without squelching his puck-moving ability and offensive contribution...
Essentially, all of the things you'd expect a young, offensively-gifted, first-year pro to need to clean up. I'd expect Gildon will both flash and struggle at times early in his AHL career - but he has always been a quick study and, by all accounts, a very coachable player who works hard to be better defensively. He'll never be among the NHL's best defensive defenseman - its just not his game - but he can definitely improve his positioning and man-on-man physicality and be good enough, allowing his offensive skills to really play up and flourish...
Once he gets comfortable at the professional level and starts moving pucks quickly and confidently he'll certainly be a treat to watch in that regard (as well as on the PP). He may make some mistakes from time to time and you may need to pair him with a reliable partner to cover for him when he jumps into plays or tries something a little too ambitious, but I think he has the makings of an NHL defenseman. With a lot of ceiling...
