Then you are either lying to yourself, or you don't think Doughty is an upgrade on Reilly...either one is possible, I think both might be true....
I'm going to start by saying the Leafs are one of the few teams that I specifically cheer against so that you understand that any good thing I say about them makes me hate myself a little.
Morgan Rielly is currently 8th in scoring in the NHL. Among all players, not just defencemen. He's on pace for 100 points from the blueline. I don't remember the last time that happened. Soak that in for a second. 100. And he actually plays a decent defensive game.
Now, for posterity's sake, let's recall that the guy you're replying to is replying to your suggestion that Doughty is worth Rielly PLUS Nylander. He didn't say that Rielly is worth more than Doughty. But actually, if the way Rielly is playing now is the way he's going to play going forward and not just an insane hot streak, yeah he's worth more than Doughty all by himself.
Doughty is a great player and would do wonders for the Jets. But he's an incremental upgrade on Trouba and costs a bare minimum $3m more than Trouba will and is ~5 years older. That's a big deal for a cap team. We can add to Trouba, but it would be something like a 1st and a 3rd in different drafts, or a prospect like Vesalainen.