It’s not surprising that you do not know that DT3 exist, because majority of forum members usually limit their trust list depth view to DT1 and DT2. That’s why the trust ratings by DT1 and DT2 are more visible and powerful than DT3.
No members in the forum are more powerful than others. If you think being DT1 or DT2 members means you are more powerful than other forum members who are not chosen and voted as DT1, DT2 members, you are wrong.'
We are all the same in the forum and if a DT member misuses the DT trust list and especially DT Trust Feedback, you can simply add that member to your Distrust list, it's done simply as it should be. You don't need to be either DT1/ DT2/ DT3 members to distrust another forum member and exclude his trust feedback on your profile.