Assuming Byfield doesn't go to Buffalo, and you have those 3, you put Kopitar in the heavy defensive minutes role. He's better offensively when not deferring to any wingers, as we saw in 17-18, so you can put Kopitar with anyone. He'll be fine. He won't complain. At least publicly. He'll go out there and do his job. It decreases Kopitar's minutes, which should've been happening these last few years anyway. The Kings have yet to replace Stoll. They have yet to replace Fraser at C. I'll make Eichel/Byfield/Kopitar work.
You're not getting any real assets for Kopitar. That time is long gone. The best you're doing is just getting rid of 50% of the contract, but you'd probably have to take a contract back, which sort of negates that.