That's interesting, because from what I see Sengun has not made the Rockets any better, at all. However, I can easily argue that Davion has been a major factor in the cultural shift of the Kings. And, they are a much better team since his arrival. Big Picture stuff... wins championships.
I wouldn't go so far as to say that Sengun hasn't made the Rockets any better, but I appreciate the spirit of what you're saying here. Kings fans pining for Sengun, who would basically replicate the strengths and weaknesses of the All-Star center that we already have, is in the same category for me as the Kings fans who are still pining for Haliburton while Fox has been playing at the level of a top 5 guard himself. These guys would not be able to do what they're doing now if they were on the Kings and getting only a fraction of the touches that they currently get as their team's #1 options.
The whole point of the Davion pick (at #9 overall mind you -- which is on the low end of the lottery curve) was to get a guy who can excel in a role which doesn't involve pouring in tons of shots or dominating the ball. Criticizing Davion for his failure to pour in a ton of shots and/or dominate the ball (or even just benching him for his lack of offensive efficiency) just reveals to me that these people don't value the importance of defensive specialists to building a well-rounded team. Because on that end of the floor he's been every bit as good as advertised. We need more guys like Davion to fix this roster -- players who bring the same level of intensity but at the wing position and on the interior.