Beckman needs time to develop physically, and mentally. Remains to be seen if he can. I was impressed with the improvement in his skating and two way play, and think it can get even better with more strength. The guy is very lean right now, but has decent height(6'1"?). I think he needs more AHL TOI. Not overly positive about him, but he has a chance to become a secondary scoring wing in the NHL in 2-4 years.
Chaffee is 24 yo. He is what Beckman will be in 3-4 years if his development is mediocre. Scoring W with decent size, speed, shot, strength. Sort of a stronger, faster, Donato, with a lesser shot and skill. Don't think he can be a Duhaime type, but maybe? Doesn't really have a grinder's mentality. Tweener.
Lizotte is a non entity to me, but i guess there's always a chance that he is the next Soucy. Right now I regard him as an AHL Dman with no upside.
What sticks out about Dewar to me is that he is a guy who is laser focussed on making it. He has a NHL mindset/determination. I think he is one of those guys who had to fight for everything - this is no Gentry Academy grad with rich hockey parents. Skating is NHL quality, puck handling is decent but not special, shot is surprisingly good. Good two way player. Not big, and will be overmatched by certain types, but very willing and smart in puck battles. Reminds me of Spurgeon, in many ways. I think he will be a NHL'er, either with this team or somewhere else, if Guerin decides to sign yet another useless vet rather than go with Dewar. I can see he and Duhaime making a good team on a 4th line with speed, grit, and a bit of offensive ability.
Shaw - one year older than Dewar, one inch shorter. Thick, and scrappy. OK speed and skating. Have some doubts if he is big enough , fast enough, smart, or skilled enough to fill a role in the NHL, but he is determined. Tweener'ish.
Duhaime is a 4th line NHL'er. Slight chance he develops into something more. Good speed, physicality. OK shot. Can fight a bit, but is by no means ready to take on anything but middleweights.