Well, Leo is delusional if he thinks he can get Karlson for 4 picks with only one first rounder and Seabrook, whose contract is a net negative at this point.

Seabrook's contract is toxic. Great Player but he is on the wrong side of the hill and not going to get better. So you are giving up one of the 3 d-men in the league for what, because the 1st in 2020 has to be to take on the Seabrook contract. Never going to happen.

I posted a similar comment a few days ago on a proposed Seabrook trade. If one seriously wants to trade him and his contract, it has to hurt. 4 draft picks doesn't hurt enough.
Think about the Bickell trade. I believe he had one year left at a $4M cap hit. It took Teuvo to trade Bickell and get a 2nd & a 3rd in return. That's a decent secondary scoring winger in order for a cap floor team to take one year of a bad contract. That kind of hurt as a fan to make the trade.
To trade Seabrook, who I think was great at times and is still good-just not top pair good, with that many years and at a 6.8M cap hit...by the time it gets worth it for another GM it's hampering the Blackhawks more than not being able to sign whoever one thinks they should.