Shake the tree, see who falls out. The underlying message of the press conference was "we have some information, come forward now and co-operate with the investigation, dob in your suppliers and your punishment will be less severe"
I'm not saying this is the case, and I have no idea what - if any - evidence they have. But that as what I took from it.
As I said in my original post yesterday, the investigation concluded 5 months ago. No "real" evidence of "peformance enhancing " drug taking was found in any Australian code. I stand by my assumption that the whole thing is Political, and have seen or heard absolutely nothing to suggest otherwise.