"I don't really have a great feel for what Orlov is worth, and I'm sure Washington is high on vrana but I think Marner would be the guy to get OVI past Gretzky. Be constructive not a crybaby"
Orlov is really, really consistent. Over the last five years, among left-shot defensemen, he's tied with Yandle for 7th in even strength points, just one ahead of Krug and two ahead of Muzzin:
http://www.nhl.com/stats/skaters?reportType=season&seasonFrom=20152016&seasonTo=20192020&gameType=2&position=D&shootsCatches=L&filter=gamesPlayed,gte,1&sort=evPoints&page=0&pageSize=100
On a lot of teams, Orlov could be the power play point guy, and have some 60 point seasons, but in WSH he's more likely to kill penalties and play a shutdown role. So his value is basically Muzzin, a little pricier, but 2.5 years younger. Same skill, but same role makes both almost anonymous, but still very valuable.
This year, among left wings, Vrana tied Gaudreau for 10th in even strength points, with 40:
http://www.nhl.com/stats/skaters?reportType=season&seasonFrom=20192020&seasonTo=20192020&gameType=2&position=L&filter=gamesPlayed,gte,1&sort=evPoints&page=0&pageSize=100
Among right wings, Marner was 8th this year, with 42:
http://www.nhl.com/stats/skaters?reportType=season&seasonFrom=20192020&seasonTo=20192020&gameType=2&position=R&filter=gamesPlayed,gte,1&sort=evPoints&page=0&pageSize=100
Not that different. Both played with good centers. Both did well.
The biggest difference between Vrana's and Marner's trade value to a team with room on its top power play unit for either of them would be Marner's power play points output. To Washington, the biggest difference is cap hit. For the price of Marner, WSH has Vrana plus TJ Oshie, who was on pace for 31g 58p this year.
So my idea of a counteroffer would be something more like Marner and Mikheyev for Vrana and Oshie. Each team gives up one good contract and one bad one. WSH gets a little younger, while Tor adds two leaders with a recent championship. Tor gives up guys who totaled 90 points this year, and gets back guys who totaled 101 points this year.
Basically, each team gets to say it got rid of its worst contract, without a significant drop in talent.