Yeah, folks really need to let the narrative of Toronto players not being cap comparables around the league because Toronto's management can't argue favourable deals die. Those contracts are comparables and will be used as such by players and agents.
Every deal signed around the league can be used as a comparable.
The narrative that Quinn took a team friendly deal also needs to die, because he didn't. Both he and Pettersson sat out and took at least market value on their current deals, those were not easy negotiations. Neither player gave a discount of any sort, Hughes's deal has just aged better because it's got more term attached to it.
I said this the other day, Miller wasn't willing to bet on himself the way Pettersson is and took the security in the form of dollars and term. Could he have gotten more if he'd waited? Absolutely, but he chose to take the sure thing. And as you've said, skeptics of the deal weren't expecting him to immediately fall off a cliff, it's the latter end of the deal that most critics didn't like. He's fine at 8M right now, we'll see where he's at when he's 33-34+.