I've seen Kadri play more then enough times to know he will never be better then a low 2C but a very good 3C. He's in the 50-70 range of centers in the league. Dubi on the other hand consistently defends like a 2C and scores like a 2C but right now I would say Dubi is aging his way into a 3C now too by the way his year has started.
Also to the leafs poster JJ is in no way remotely close to over paid or a cap dump. He is also not a bottom pairing guy he is a 3-4.
Will disagree on Kadri, if you take out last year where he had a brutally, unsustainably low shooting percentage he's been a fine 2nd line centre. And if you're giving him credit for being the 50th best centre in the league, that's a good 2nd line centre. He also had atrocious line mates last year. His career production is slightly better than Dubinsky's but almost identical, and aside from last year they look like very very good comparable players. Kadri is 4 years younger and makes $1.35mil less on the same term. It's easy to fall in love with your own guys, but there appears to be very little separating Dubinsky and Kadri other than age and contract - also understand that acquiring him doesn't address your need for a #1C
I don't watch enough of Johnson to know what he brings, but a quick glance at the numbers makes him look like a guy who is asked more than 3rd line pairing minutes and quality of competition, but gets thoroughly overmatched by his competition with negative affects on his teams own shots, the other teams shots and productive possession - while getting paid like a second pairing guy. I've heard he can go beast mode and make you see what got him drafted so high at times. The data I'm looking at is last season and previous, so I would expect his usage to change quite a bit with Werenski hitting the scene. At face value, Johnson looks like a guy at risk of becoming a bad contract who was asked too much of and didn't deliver - not a massive risk because of the term
I'm also not advocating this trade, it doesn't do anything for the leafs and I want to see what Kapanen turns in to. Jenner is an interesting piece but the fact that he scores all his goals from close range where someone else got the puck to the net worries me, he might fit will with uber-skilled linemates like we'll have going forward but I think that's a fillable need without giving up Kadri or Kapanen