I reckon your list is pretty close 'bub, but like a few others I wouldn't mind Buckley being given a bit more opportunity .... perhaps later this season, although that would be tough on him given that he's missed so much footy.
I also reckon that Newton should see out his contract ... obviously the FD saw something in him 12 months ago, and while he hasn't set the world (or even the VFL) on fire, he has developed aspects of his game that we havn't seen before. Still a long way to go for Juice though!
One player who isn't on your list, but whose name has been bandied around a bit in this context is Tom McNamara. He's a good size, young, and from all accounts shows lots of potential. He's had a wretched run with injury, but I certainly hope they persevere with him.