I think that Alito is prodding Roberts and making himself a potential whistle blower to trigger a Supreme Court housecleaning if Trump gets back in and the Senate goes to the GOP. If so, then a whisper to a new Trump administration could lead to an enforceable private demand for one or more Supreme Court resignations. Alito has put down quite a marker toward such a possibility.
It also sounds as if Alito is also cleverly telling Roberts to get serious about the investigation, for the sake of protecting the court’s credibility and the security of its members. In other words, if Alito has a good idea of who the leaker is then the “investigation” needs to make more effort to look harder at potential suspects.
Investigations in Washington tend not to be real investigations.
This is such a serious breech of security that the use of lie detectors should be warranted. No person is more important than the integrity of the institution IMO.