Matthews is in no way, shape, or form, close to the greatest Leaf ever lol. This is silly, recency bias nonsense.
But, yes, if the Leafs pay Matthews what he wants (not what he deserves) then one or both of Marner and Nylander will likely need to go. Then you'll get to see your favorite player skate with lesser talent and continue to lose in the playoffs until he gets frustrated with the constant failure or heat then demands a trade or walks for nothing. Sounds terrific, no?
I agree with you completely about Marner basing his contract off Matthews, which is utterly insane. Marner is worth no more than Matt Tkachuk and he makes 9.5 x 8. Nylander is a little more tricky, but I think he deserves Timo Meier money and it has nothing to do with Matthews or Marner.
The way the Leafs absolutely submit to Matthews and never hold him accountable is rather absurd. And the fans are even worse which is ridiculous.