^^ I think you had a similar reaction when Miro Heiskanen got his lengthy 8 years, $8M+ a year contract with the Stars. Based on what I have observed and read on a Discord group that has way too many Senators fans than one would think, Sanderson was the Senators 2nd 1st round pick they selected in the 2020 draft (5th overall behind Tim Stützle who they picked at #3). Only 77 games at the NHL level and 30+ pts as a defenseman. Apparently, fans and non-bias media really felt like the Senators really had a hit on the 1st round picks over teams like Rangers, Kings, Ducks, etc. picking those two players at the spots they did.
The main logic behind this signing from what I'm reading is that the Senators are really impressed with this guy and that they think he's only going to get better from here and thus they feel the need to lock him to term at the AAV now before his perceived value goes up? The contract does not kick in until the 24-25 season. I question if that's what Sanderson got, what will Owen Power of the Sabres will get (when he was drafted #1 overall in 2021, had a good debut season, came in with more buzz than Sanderson, and finish 2nd in Calder voting)? Plus, the Sabres will need to extend Dahlin as well. The rumor is that Dahlin is going to get $10.5M x 8 years that will kick in at the 24-25 season. Going to be interesting to see how this Senators' extension will influence what the Sabres need to do to lock their two centerpiece defensemen.