The OP reads like a very one-sided Op-Ed piece. There is just enough true information that some under-educated people might think this makes sense, but it comes off like a "I want this, and I will reverse engineer a trade to justify my ask.
1 - Yes it is a value of - but you have assigned a value with your suggestions by offering players like Henriksson, MC-B and doubled down with the dumps the Sabres could take on Belzille etc. Quite clearly none of these pieces have even close to enough value to be the main piece in a trade for Samuelsson but you included these in your post which leads to the assumption that this is your perceived value. For a teams top 3 big strong stay at home dman, signed to a very team friendly deal long term - all the pieces you mentioned would be the +'s not the main value in a trade.
2 - You are asking for the Sabre's #3 dman in ice time, #2 LHD, he is 23 years old and signed for less than $4.3 for the next 7.5 seasons. He is 2nd on the team in blocked shots, 2nd in hits, 2nd amongst Dmen in PK time. He is 6'4" and plays a very important role for the Sabre's. Without him the Sabre's clearly would need to bring in a defense first 2nd pairing dman. Doesn't make any sense for a young team to trade a 23 year old during a re-build. So clearly no thought into the Sabre's needs or team were considered in the OP
3 - The players you mentioned from the Rangers are not even in the same realm as Samuelsson from a team value perspective. Henriksson is a 22 year old undersized forward that has 23 points in 93 AHL games. This guy is the + to try to sweeten the deal. BM-B is an overager in the OHL who's scoring has dropped this season over last. I don't see any value at this point. He is trending towards not being qualified, not being a trade chip for a top 4 NHL dman.
4 - What does Buffalo need to improve their team? So moving an NHL roster player off the roster is the goal, but where is there weakness in the Sabre's system? Players on the Sabre's under 25 years old - Peterka, Cozens, Quinn, Benson, Krebs, Dahlin, Powers, Samuelsson, Joker, Levi, Luukkonen. Players not on the Sabre's yet Rosen, Savoie, Ostlund, Kulich.
So the need for young forwards without much chance of making the NHL is not very high. Top 3 needs for the Sabre's seems to be 1 - NHL goal tending, 2 - NHL bottom 6 depth (I know this sounds crazy, but sometimes a Morgan Barron helps win more than a Victor Olofsson, 3a - NHL third pairing upgrade or 3b - high end defensive prospects. I'm not a Buffalo but this is my take. The issue is that your proposal does not provide any sort of improvement in the areas the Sabre's need. No goalie, no improved depth and no high end prospects of any type.
5 - I understand the premise that the Sabres' would be looking to solve a roster size problem. What I don't understand is why anyone would think that the best way to accomplish this would be to trade away their 23 year old #3 dman. It would seem to me that you could accomplish the same thing with much smaller moves or moves that add valuable assets that the organization needs. Olofsson, Jost, Greenway, Okposo, Robinson - would all be waived/given away before Buffalo would trade Sam for pennies on the dollar, Benson, Quinn, Peterka, Powers and Levi can all be sent down with no waivers - even if its just a paper transaction and they stay with the NHL team.
6 - So I don't know what the value of Sam is in a trade, but if I'm the Sabres and I'm trading with The blue shirts I would be asking for Rangers #1 (its going to be late in the round) and Robertson. Even that might not do it given the teams lack of internal replacement.