Rich, there are a couple of things about the draft that are a little uncertain to me, especially given that the expansion draft is in June, when the Caps' season may still be going on (or not, who knows?)
(1) In addition to who you can protect, there are certain players you MUST expose: 2 forwards under contract through at least 2022 who played at least 40 NHL games this season or 70 NHL games combined the last two seasons; one such defenseman; and a goalie either signed through 2022 or an RFA given a qualifying offer. (I wonder if these game floor numbers will be reduced given the shortened seasons due to COVID?)
(2) What happens, if the Caps' season is over, to players such as Vrana and Siegenthaler, who are likely to be unsigned RFA's at the time of the draft. Are they exempt from selection, or must they be protected in order to assure they are not selected? Similarly, if Ovie isn't signed as of the time of the draft, what is his status? Does it depend on whether or not the Caps are still alive in the playoffs? That doesn't make sense.
Let's start with the goalies. I assume that the Caps protect Samsonov. I THINK Vanacek is exempt from the draft, because he is as first-year NHL player (first and second-year players are exempt). Actually, I think that Copley was given an NHL contract that runs through 2022 so that he can be brought up and be the goalie required to be exposed in the draft.
Next, defense. Van Riemsdyk was NOT signed to be protected, so he will be a/the qualifying defenseman to be exposed. Chara will be a UFA and not on the team's radar WRT the draft. Kempney is off the radar because of his injury status. That leaves Carlson/Orlov/Dillon/Schultz/Jensen/Siegenthaler. Rick, assuming you are right about Siegenthaler's status, here is where the tough nut is. I'd protect Carlson, Dillion, and Siegenthaler and let Orlov hanging out there, but as far as I can tell the coach isn't utterly enthralled with Sieg, and we DO have Fehevary and Alexeyev coming up the pipeline. I suspect we are going to lose a defenseman when all is said and done.
Finally, forwards. I don't have a quibble with your selections, except that I don't know what Vrana's status is as an unsigned RFA. I guess he has to be protected if the Caps want to keep him. Obviously, with Dowd, Hathaway, Haiglin, Panik, and Sprong all signed through 2022, there is no shortage of qualifying forwards we will leave exposed. Might Seattle select one of our primo 4th line guys who have been so solid this year? I sort of doubt it, because these are the types of guys that will be left exposed throughout the league. Seattle will have all sorts of players like this to select from. BUT, Dowd, as a center, decent face-off guy, PK guy, might be worth a selection -- will he be better than all the other players of his kind who will be available? The other threat as a loss might be Sprong, given his resurgence this season, and he's only 24.
My thoughts, FWIW.