I don't think the term “perimeter league“ is accurate. It's a pick&roll and spacing league. Most successful teams built their offense around those two variables.
Right now it's not a “back to the basket“ or “isolation play“ league and I think, that's what Grant wanted to say.
Now we are a very good offensive team, so I agree with Brick, that we should mainly worry about the defensive side of the court. But our offense is that good, because we run and score quickly. When we are forced into the halfcourt, our efficiency drops and the amount of forced shots and TO's goes up. That of course leaves us with problems on the defensive end too, like transition defense, where we absolutely suck.
So yes - our style of offense is related to our defensive problems to some degree.
What's comical is, that Grant thinks this is Cousins fault. Cousins is one of the new generation big man like KAT, Ad, Okafor, Porzingis, Blake. He is not a classic center, who needs to play underneath the basket. In fact I think he posesses the best perimeter skillset out of all big guys right now, which is why he is so difficult to defend.
In the right system he should be able to win in this league, even when it's very difficult for big man nowadays.
But like every franchise player, he needs enough help and this help should mainly adress the area of perimeter defense.
We gave up career highs to almost every 3pt marksman out there. And if you pay attention to Cousins body language a lot of the negativity is related to the amount of wide open 3's we give up every night.
You don't fix the Kings by trading Cousins for Blake. You fix them by finally improving their perimeter defense.