So let me see if I understand this right...
You are claiming that Columbus has already had contract talks with Mitch Marner and they've already made him an offer which he refused.
You are now suggesting that the player that *know* doesn't want to sign for the number they are comfortable with paying should be acquired, by them, at the expense of not only their best player, but a player that is clearly better than Mitch Marner and then, after the dust settles, they now have the rights to Mitch Marner and they know he doesn't want to sign for the number they think is right.
Bizarrely, you think that Marner "doesn't have much control" despite the fact that he would have all the control in the world because he would be an unsigned free agent that Columbus inexplicably just gave up their best asset to acquire even though they were able to negotiate with him and offer him a contract before making a lop-sided, franchise crashing trade.
Sounds like a brilliant idea.
Let me just take a wild stab in the dark here... you're not a Columbus fan?