What is "it"? #9 only dates the talk prior to the murders.
From the AD:
9. On 06/26/2006, SOI2 was interviewed and explained that on the evening of 3/11/2006, Green and KP1 talked about raping the woman. The woman lived in a home behind the TCP. Green and KP1 had previously been to the residence. Subsequent to the conversation discussing raping the woman, SOI2, SOI3, KP1, and Green went to the home...
Now it may be that subsequent could have meant the next day, but doubtful.