I don't love the fit, but the Kings can afford to be opportunists here. If they're ready to move on from WCS (and, at this point, perhaps they should be), they could do a lot worse than adding Clint Capela to the roster via trade, particularly at Capela's age and price tag, and especially if they don't have to give up any core pieces to get him. He's only 25, and locked in for four years on a reasonable deal.
If the fit is awkward, then the Kings have a worthy trade asset to use in the future. As close as the Kings may be to playoff contention, they should still be in asset collection mode. We don't yet know where the Kings' young talent will eventually plateau. They absolutely need to find sneaky or cost-effective ways to add additional talent, because the West is only getting more treacherous. I anticipate that it will actually be tougher to snag an 8th seed next season than it already was this last season.
With the Warriors suddenly vulnerable, Houston (and a lot of other teams around the NBA) are going to be desperate to make a push to get into the Finals next season. The Kings' front office should be poised to take advantage of that desperation. They've got tons of cap space, and they can use that to their advantage on the trade block, since they don't have to send back equal salary. Capela's a good target, I think.