Bozak was +2 just this year. And hey I'd be all for Kadri if he didn't play 3rd and 4th liners as a 2.
You do realize +/- has no bearing on a players ability right? You also realize QOC in any form also barely has any bearing on a players ability one way or the other right? We aren't talking a 10% difference here and 20 lost points. It's maybe 2-5 lost points playing top QOC and even 3rd line QOC. In fact, what you call top quality for Bozak and 3rd and 4th line quality for Kadri is players like Spezza for Bozak and Krecji for Kadri. You hinge your whole argument on these two things and they mean nothing minus the fun we all apparently have with you. In the big picture, Bozak faces worse comp than Sam Gagner. Can we assume that Gagner is just as good because he has to fight through offensive forwards trading chances 5-10 times a game? Of course not. No more than we can argue Grabs should or shouldn't have been bought out because of his +/- and QOC vs Bozak or Kadri. He made too much for his position in the lineup.
You trot out a stat and you know nothing about the actual numbers behind it or the difference overall in the players faced or what they do on the ice. Somehow you go from A to B thinking Bozak has faced Gretzky, lemiuex, and Orr all game while Kadri faces Colton Orr, Brent Gretzky, and Jocylen Lemieux. He faces 2nd lines mostly, with first lines and third lines thrown in. Significant difference here? No. All very good NHL players and in fact, if you go though NHL teams, most of the very good defensive players are on those lines, not the first. If you watch the games, he is the absolute driving force on his line. His line by the way consists of a winger whose by far best season came playing with Kessel, and another winger who is called the worst contract in the NHL, vs Bozak who plays with a bonifide top 10 offensive player in the league and a guy most consider one of the best contracts in the NHL.
Tell me, if you switched the two centers, who would you have faith in at least duplicating their seasons point values, Bozak or Kadri? You could argue the team would do better or worse all day long, but we just missed the playoffs. For me, 9th or last, no difference whatsoever.