How much certainty do we have that WCS is going to effectively defend 3s, really? MKG, certainly more of a three-type than WCS, was hearkened as a great defender coming out of college. Last time I checked Gay tore him apart when he was matched up against him. The question really is: How much is WCS going to reduce the offensive effectiveness of the guy playing against him relative to his own offensive production? Is WCS really the guy you want chasing around screens after 3s? Is he the guy you want at the 3 point line defending the 3 where he can't be used for weak-side help or rebounding? A favorable matchup for WCS is a guy like Reggie Evans, who will always be lurking near the basket. WCS can then have a greater effect on weak side defense and double teaming bigs. (This would be offset somewhat by Evans out-rebounding him). But the further WCS gets away from the basket, the more his defensive impact is going to be reduced, imo.
Also, I really don't know what you mean by: "unless that tall 3 is a good rebounder you're still losing on the glass against Cousins/WCS. Of course rebounding Cousins + WCS >> Any 3 in the league. It's not Cousins and WCS; it's WCS vs the opposing 3. The further from the basket WCS goes, the greater the reduction of his rebounding effectiveness. If WCS were matched up against opposing 3s, I could easily see opposing 3s matching WCS rebounding output because of it.
Anyway, regardless of whether one agrees or disagrees on the specifics of the above, it would seem useful to identify what matchups WCS would be great against and those that would diminish his defensive impact on the court. If Karl is looking at WCS in the film room, he's going be asking himself what matchups would be optimal in his use of WCS. We should be asking the same thing.
MKG really is a fantastic defender in the NBA. It's his utter inability to shoot that hurts him. And of course he's much better against perimeter focused SFs because he's somewhat undersized. That's why Rudy gives him trouble - he's a long, powerful SF who can punish him inside and shoot over the top of him. And I'd also argue that one of the best attributes of Cauley-Stein is taht he CAN step out and defend away from the basket at a high level. Would I want him defending guards? Nope, not other than a brief show or switch on the pick and roll. On the other hand, he's absolutely the guy I want on mobile (not necessarily stretch) bigs. But I digress. It's absolutely a great thing to consider what matchups benefit a guy like Cauley-Stein.
But regardless of whether we are talking about WCS or anyone else, the question is always there when an opponent goes small - do you try to look for an advantage that your team has because of it or do you change your lineup to match your opponent? Whether the Kings draft Cauley-Stein or not (at least as the roster stands right now) Jason Thompson will likely be the starting PF on opening day. If a team goes small against the Kings now do we pull Thompson or not? I'm a JT fan but let's not pretend he's a potent post scorer.
Essentially I look at it this way - Cauley-Stein works in matchups the same way DeAndre Jordan does. If anything Cauley-Stein is a worse rebounder (mitigated by Cousin's presence) but a better free throw shooter and has the form to be a much better/more consistent midrange shooter. But both guys are low usage (on offense) defensive anchors who get their points off dives to the hoop, running out in transistion, putbacks, dishes off guard/wing penetration and alley-oops. There will be matchups where he's not ideal, that's true. But outside of the very best players in the game there are always matchups that aren't ideal. Personally I put a huge emphasis on fixing the Kings' awful defense against the pick and roll and having a guy who can disrupt the P&R with his length and quickness would go a very long way to shoring that up. And even though he's coming out as a junior I think people will be surprised to see WCS be a better, more versatile player in the pros than he was at Kentucky. Most fans didn't realize Cousins had such a good jumper or such a good handle coming out either.
First off, I don't think Thompson is that bad of a player. He rebounds and can hit a 15 footer. However, where we had problems in games was often in crunch time when we needed a basket to remain in the game. Obviously you want to get the ball to your best player. But Cousins was often rendered ineffective because teams would just put 3 defenders on him. So we had to go with Gay who I don't feel is a clutch scorer. Closing out games has been our biggest problem for 2 years. Even when we were playing well to start this past season. WCS doesn't solve that. So, although I'm perfectly fine drafting WCS, I don't think he's our savior. He would be another nice piece of the puzzle.
I also think our perimeter defense is worse than our interior D. I think WCS would have a much more difficult time defending on the perimeter in the NBA.
I don't think Cauley-Stein is the Kings savior either. But unless Mudiay drops and is the real deal I don't see an all-star that will be there at the 6th pick. There almost certainly WILL be one because there almost always is but I can't say with confidence who that guy is. Which is why I don't know that I'll be upset on draft night regardless of who is drafted. Now if the pick is traded for a veteran player I'll likely have a strong opinion right off the bat, but Mudiay could be a star/go to player. So could Hezonja. I don't see it be possibly Porzingis. Or even a guy like Oubre or Lyles or Payne. I have no idea. But I'm pretty sure of what Cauley-Stein would bring and how it would help.
As for the Kings perimeter D being worse than the interior - part of the reason you want a guy like Chandler or Camby or Cauley-Stein is that he is a fleet footed weakside defender who recovers to help against penetration etc. He helps the perimeter D by being a guy that can help erase mistakes and blown rotations. And as mentioned, he could be a huge disruptor against the pick and roll which is one area that Thompson and Cousins have always been subpar, to put in politely.