I respect the balls it takes to propose a trade like this. Props to you. I would counter that you could get more for JT since he is so elite and signed for 8 years. Although bringing in Carlson and Grubauer (I would want Samsonov more but whatever) looks great for the NYI roster, why would WSH want to get JT with Kuznetsov and Backstrom being their top centers. I don't think WSH wants to put either guy on the wing to make room for JT.
I like the idea of signing and trading JT but don't think WSH would be the best fit despite their ability to give you Carlson and a promising goalie

I don't see either team trading a top player within the division.

Also, I can't see both players agreeing to sign and trades this close to free agency.

Yeah. The Caps don't need Tavares, but I don't think either team wants to end up with nothing. If you think I'm thinking too much about what the Isles need in order to win some hockey games, and not enough about what's in it for the team I've rooted for, for the last few decades?

I'll take it. https://www.youtube.com/watch?v=-Gi4tOrKphw

Thanks. Yeah. I guess there's a tradition of testing the market. But this might be the first time we've had two UFAs good enough to where the 8yrs with old club/7yrs with any other club rule actually makes a difference in how much they'd earn, and other teams are probably not that interested in making a sign and trade right before the players go to free agency, so there's a mutual opportunity for Washington and NYI to each get one of the biggest fish to tempt free agency since Stevens and Shanahan.