The problem with that logic is that the Cups have already been won, and they were won with team play. I don't see what a 2014 Cup,which is in the bank, has to do with Kopitar's caphit in 2022 based on a contract signed 2016. The contract has to be about value going forward, not about value provided in the past. If Kopitar is going to bring $80 million worth of value to the Kings, fine sign the damn thing.
I understand your point and I'm not saying you're wrong, just offering up another way of looking at it.
I'll try to put it another way, having Kopitar on the team has value beyond what he brings on the ice at this point, he is a hero partly because of the huge role he played in bringing those cups to LA and I'm sure the fans want him on the team. That has value.
Let's say the Leafs win the cup in 2021 and 2023 and Marner is widely considered to be our best forward during those years. I'm sure many fans would rather overpay Marner and keep our hero in a Leaf uniform then quibble over a million or two.
My original point still stands also, LA is in win now mode. You risk overpaying Kopitar in 2022 sure, but that's the price you have to pay to keep him now when he's not overpaid and without him, you can kiss your cup dreams goodbye. Kopitar got a fair contract, his agent could have insisted in getting the same money as Toews and if LA didn't pay, someone would have I'm sure of that. Then again, LA was able to give him 8 years so it all evens out.
In the end, I have a feeling Stamkos will get the same money. It's a bit of an overpayment but that's the price you pay for signing big name players who are UFA's (or pending UFA's). It's less than Toews and Kane got (which is fair) but 10m is such a big line psychologically, the difference between 9.5 and 10m is be the same as the difference between 10 and 10.5 but there's just something about that 10m number ...