Quoting: Sebybbq
A 19:11 minutes 29 years old defenseman,he is not worth a late first. Its not like he have been a consistent defenseman is whole career he only have 170 games played and he hasn’t have incredible number. He benefits the Washington system a lot. Justin braun return would be a starting point for comparable.
If you go by average minutes per night, you start thinking a bunch of rookies who played three games, and got double-shifted to rest veterans, are top four defensemen in the NHL. Look at minutes per year, where Kempny's just ahead of Shea Weber (7M), Josh Morrissey (6M), Nate Schmidt (5M), and Erik Karlsson (11.5M) last year. All are in the top 124, so they're all "top four" defensemen, on the season, by ice time.
http://www.nhl.com/stats/player?aggregate=1&report=timeonice&reportType=season&seasonFrom=20182019&seasonTo=20182019&gameType=2&position=D&filter=gamesPlayed,gte,1&sort=timeOnIce
Braun also played 2nd pair minutes. More minutes, in fact. But a lot of teams value offense, defense, and cap hit, more than just ice time. Kempny tied for 77th in points by a defenseman with Niskanen ($5.5M) Vlasic ($7M) and a couple younger guys who will get paid soon. Braun was in a 7 way tie for 122nd among defensemen with Dan Girardi (retired), Kris Russell (Edm can't give him away at 3.5M), Brayden McNabb (some Vegas fans want to pay to give him away),Eric Cernak (might get benched for Shattenkirk), and Dennis Cholowski (might start this year in the AHL).
Braun was 301st among NHL defensemen in plus/minus last season. Kempny tied for 9th with Victor Hedman ($8M) and Morgan Rielly (a steal, at $5M).
http://www.nhl.com/stats/player?aggregate=1&reportType=season&seasonFrom=20182019&seasonTo=20182019&gameType=2&position=D&filter=gamesPlayed,gte,1&sort=plusMinus
Braun makes 3.8M, and he's 32 and a half years old. Most hockey players get a bunch worse around their 34th birthday, so Braun has one more reliably good season, if you had to predict, and essentially fetched a high 2nd as a rental. Kempny makes 2.5M, and he just turned 29 in September, so he should have about five more good years. Three of them are signed at just a little over half of Braun's cap hit. Kempny's on a really good contract, and a cap dump like Braun, whose plus/minus was the worst on a blue line that included Erik Karlsson, is not a good comparable. Braun got a high 2nd, 41st overall. Kempny is worth a 2nd and a prospect, or a late 1st. Or a 20 goal checking wing his same age, like Ceci for Brown. The last guy to do Kempny's job well, Karl Alzner, makes 4.5M, which was offered to him after he had a really bad year, in the hopes he'd get going again. He didn't. The guy who filled in, in between, Brooks Orpik, was overpaid at 5.5M, but would have been a steal at 2.5, when he was still quick enough to be effective.
Teams looking for a top-four LHD, that might not make the playoffs, like Montreal, NYR, and New Jersey, could get Kempny for their 2020 2nd and a forward prospect they don't need. If Toronto randomly calls about Kempny, the price is a 1st plus Tymashov. If they don't get good offers, the Caps are more likely to consider trading Djoos or Copley to get under the cap, than to give away an effective top pair defenseman on a great contract for nothing.