He wouldn't have told them anything though - knife or dirt.
*break glass and don anorak*
In highly contested big murder cases like this, there is a game within the game. The accused never tells counsel if he did it. Instead, the accused shares a version of some sort with counsel which is then massaged and rehearsed into a defence. Particularly if the accused will testify, this overall narrative is key. Especially as the only person who knows the real timeline, the accused can zero straight in on mistakes in the witness evidence via counsel. Pistorius played this game like a master.
IMO this is what Chase is doing. He knows the bra was cut with a knife, and can use this knowledge to spirit up a graveside rape - a fabrication of the real rape. He knows the difficulties of the crime scene because he was there. So when the defence say - hey look at all this mess - it's because Chase knows very well it didn't go down that way, and can share his thinking with counsel back stage. After all, on the state case, the accused had days to stage this crime scene. No one knows it better than him!
Sometimes accused or counsel make a mistake and we get to see backstage. Pisto made this classic error in his testimony when he couldn't bring himself to say he shot in self defence. The clown of a judge failed to see what is obvious to any Court lawyer. Namely Roux and Pisto had rehearsed testimony where he would say he did mean to shoot in self defence. This panic in the defence is important because it showed to the world that counsel and accused had discussed something completely different. That should have shot down his whole case right there (and ultimately sunk him in the Supreme Court because Justice Leach was not born yesterday).
The Provecho discussion in the jail house tapes is this mistake IMO. You can see that Chase has prepped Maline that he didn't get the 19K. Then he is prepping CJ to manufacture testimony. But he accidentally admits in the tape that he did get the 19K (and we know it from the email).
In these cases, the staging/fabrication always seeks to point away from the defendant. So we need to reverse the process. Why is he trying to lead the state away?
Chase shows us what is sensitive and what he is trying to hide.
You've said it yourself. Why does the defence care so much about blood in the house when DK did the murders?
Same thing happened to the film makers of Making a Murder back in 2006, Judge quashed (is that the right word?lol) the subpoena and their material was protected as if they were journalists IIRC. 
