Currently, I believe the Kings would benefit from acquiring a reliable big man who can improve their defense. While Domantas Sabonis is a valuable player, he alone may not be sufficient to protect the paint. Pairing him with a dependable center could have a positive impact on their overall gameplay without disrupting their existing strategies.
There aren't many top-level big men available in free agency at the moment. They could potentially acquire talents that have been rejected by other teams, but there's no guarantee of success in doing so.
One option could be Zion Williamson if the Pelicans were to let him go. However, his injury proneness could present a problem.
Another option is Rudy Gobert, who is known for being a great defender and has previously won the Defensive Player of the Year award. The question is whether he can build great chemistry with his teammates.