It's not actually about court vision or dribble penetration. IT lacks length and just can't make some passes without a risk of TO. Getting longer ballhandler, which also means on average he's a better defender, is the way to go.The Kings will need a Chandler type person on defense whether or not those types of players are easily attainable. Look at every championship team in the past except for the Heat with Lebron.
Spurs ('99)-Robinson
Lakers ('00-'03)-O'Neal
Pistons ('04)-Wallace
Spurs ('05 and '07)-Duncan
Heat ('06)-O'Neal
Mavericks ('11)-Chandler
Celtics ('08)-Perkins/Garnett
Lakers ('09'10)-Gasol
Essentially, you surround Cousins with good defensive players, but if your goal is winning a championship, you need a rim protector. Plain and simple. With the way the NBa is allowing players to play defense and with the direction of offensive schemes towards scoring guards, rim protectors are becoming more imperative. I'm curious as to how many point guards you think are available who can run an offense the way you say IT can't and can also spread the floor while playing lockdown defense.
As for rim protector, there's different levels of players, so you need one, want one, but might have to settle for less impactful player. That's why handicapping yourself with bad defenders in the starting lineup for additional offense that is not crucial would be unwise.