They had a competent defense this year, and I think the areas that were lacking have very little to do with the fit with Sabonis. Sabonis is the only + usage guy who is above average TS. You can't blame that on a Sabonis fit, because that is a purely offensive struggle and they do not play with two bigs. Fact is, their ball handlers/wings just aren't that good. Fox, Monk, Huerter, Murray are all below average efficiency players. If the Kings were actually playing with two bigs the whole time or struggling on defense you could blame it on that. That was not the case.
We are way too quick to say this guy or that guy is a ceiling limiter when they are not in a good situation. Besides, the Kings aren't even aiming for the highest ceiling. I think they'd be perfectly content to be a consistent playoff team but they don't have the overall talent to do so in the west. I don't think that roster is very good in general. If you took Sabonis off that roster, there are only a handful of players in the entire NBA who you could put on that team and make me think that's a playoff roster. Given that Sabonis is never hurt, he's probably one of the best regular season producers in the league anyways which is what they want.