So... would you trade Grubauer, Orpik, Beagle, Chiasson, and Green for Carlson and a 6th? Maybe.... I don't know.
If John Carlson commands Ovechkin money, on an eight year deal, from more than one team, then the Caps could also sign and trade him for a top ten pick, after they trade a 3rd for Mike Green's rights, and sign Green for three years. This lets them keep Beagle, add a pick, and not end up paying the last couple years of Carlson's contract.
Orpik is currently first in the playoffs in plus minus, first among playoff defensemen in hits, third among playoff defensemen in shot blocks, 25th among playoff defensemen in points, and first among Capitals players, all time, in SCF GWG. On a one year deal with only 4.5M in salary owed, and a 5.5M cap hit, he could provide leadership and stability to just about any team. After his game winning goal, the hockey blogosphere is exploding with all things Orpik, but there are also articles about him in:
The Dalls Morning News
https://sportsday.dallasnews.com/dallas-stars/stars/2018/05/31/brooks-orpik-washington-capitals-stanley-cup-final-goal-craig-ludwig
USA Today:
https://www.usatoday.com/story/sports/nhl/columnist/allen/2018/05/31/stanley-cup-2018-brooks-orpik-capitals-golden-knights-game-2/658582002/
Buffalo News:
http://buffalonews.com/2018/05/30/mike-harrington-orpik-an-unlikely-offensive-hero-as-caps-even-series/
Of course there's a good chance that these are just hockey reporters catching a good story, but if hockey reporters enjoy close relationships with team officials, there's always some chance that their writeups indicate what players a certain team might be interested in. I searched Orpik Arizona, and Orpik Phoenix and got nothing, so if the Coyotes have any friends in the press, they certainly aren't using them to telegraph any interest in Orpik. Obviously his trade value could be much better if he's going to a team that values his skill, experience, and commitment, than if he's just getting shuffled off somewhere. Also Orpik googlenopes: Toronto, Winnipeg, New York, Los Angeles, San Jose, Carolina, Calgary, Philadelphia.... So I think if there's a team pursuing him right now, it's most likely one of the two that's giving him headlines. I don't see Buffalo or Dallas bidding up more than a 4th pick for the 38 year old year of Orpik's contract, but paying a 3rd to get rid of the guy who has scored 100% of the Stanley Cup Final game winning goals in Capitals history doesn't sound like a great deal.
Also, Johansen needs minutes to develop. He should probably get a year on his strongside in Hershey and see if he can't put up 50 points in the AHL. Jerabek can eat just as much popcorn at a lower cap hit, and as a 27 year old average player, is just as good of an injury replacement next year as Johansen, so Johansen needs to be in the minors getting big reps, and getting good, until there's actually a spot for him.