Here is the starting lineup of Stan Van Gundy's 2009 Magic team that won 59 games and went to the finals:
Dwight Howard
Rashard Lewis
Hedo Turkoglu
Courtney Lee
Jameer Nelson
Dwight in the middle, surrounded by shooters. That's really it.
I think the roster as is can be much better defensively with a better defensive coach/scheme. But there's no way to "handle" the Warriors on defense. SA has a decent gameplan against Curry (a team which really doesn't have any standout individual defenders - Timmy is still pretty good but not what he once was - but plays very smart and disciplined team defense) but that team just has too many weapons to think that they can be stopped on the defensive end.
So what's the counter to that? You take the Kings' greatest strength in Cousins and force teams to either play him one on one or get punished by guys who can knock down open threes.
That's 2009 not 2016. And Dwight was a great rim protector, while Cousins is good but not on the same level as 2009 Howard (at least I would expect him not to be without looking at the stats).
And when you take a look at what Stan does for the Pistons it's Drummond in the middle for putbacks, lobs and easy hooks with a scoring, athletic, big guard in Jackson and a whole bunch of versatile wing defenders and athletic guys like KCP, Johnson, Harris and Morris. It's the 2009 Magic adjusted to the 2016 NBA, where almost every rotation player can switch on defense without giving up too much. You can switch Johnson on a PG/SG/SF or even a PF without getting punished too badly. Harris or Morris are more than capable to contain a guard in the pick&roll and can switch back and forth in guarding the opposing PF or SF. KCP and Jackson can both guard PG or SG.
The Kings? Switch DC or Rondo on a big SG and you are in trouble. Gay is not worth talking about. The only guy able to play defense against almost every position is Willie.
Why add Anderson to this mess, who only can guard PF's and is not the guy you want to step out to contain a guard in the pick&roll?
It's not all about the Warriors. It's about every team in the league, that plays with 4 quick and athletic guys.
And when you build a playoff contender, you better think about the strengths and weaknesses of the teams you will face in the playoffs first and figure out potential ways to hurt their playstyle. Just adding talent and trying to make it work on the fly might work, when you add Lebron, but not when you are just a regular NBA team.
It's delusional to think we can tinker this roster a little bit, add more offensive firepower to it and force teams to adjust to our playstyle just by signing a new coach.
Cousins drops 30+ pts and 15+ rebounds on a regular basis and teams still beat us all the time by playing their own style.