Opinions are neither right or wrong, arguments are, I'm yet to read a cogent argument, at best I've read some statistics I'm already well aware of and some half baked tautology that 'hith numbies are tho good soh heth the bestest'
As I've already said, Mats wasn't the franchise player in the Quinn Era, Cujo and Eddy were. It was a team that lived and died on goaltending. Shallow depth? Poor Mats only had Moginly, Owen Nolan, Gary Roberts, Steve Thomas, Nik Antropov, Tucker, Renberg, Corson with Joe Neiuwendyk and Reichel, Francis to play with over those years, boo hoo. That's not a lack of depth, it's a lack of franchise talent, luckily the franchise talent was in goal. So you're lying about the Quinn Era contention. Mats was a passenger and the Leafs didn't miss a beat in the playoffs when Mats broke his wrist.
Kessel finished top five in league scoring as a Leafs, did Mats ever do that? The Kessel years perfectly mirror Sundin's cap era Muskoka Five year, you see when MSLE had their spending capped, Mats got exposed. They couldn't buy forward depth (like they could in the contending years you brought up) so Mats was shown to be not a capable franchise player, An elite 1C.
Kessel was more productive and made the playoffs in the cap NHL, you can't deny the fact that Mats didn't even do that, the Leafs moved on from Kessel like they should have Mats. And in his proper place, Kessel two championships and counting. Kessel lead the playoffs in scoring, an achieve beyond anything Mats ever did.