The DOJ does not talk about its investigations until they have indictments.
I too, have been wondering why these people are not in jail.
I think that Garland feels the Select Committee is building a good case, so that when the public understands who did what and why it will not appear as if he is acting as a Democrat, but as a policeman.
He would like to avoid another insurrection by Trump supporters. He continues to say that no one is above the law.
We will have to wait and see.