There are two ranks for DT, DT1 and DT2. Any positive feedback from DT1 can give you positive green, and also you become DT2 automatically.The way how a user can be automatically DT2 is because he is put on the trust list of DT1 But the positive feedback from DT2 can make your trust become green only.

You can check Who got DT2 power from whom.And who is in DT1 and DT2 Easily. Visit This link for check who is  DT1 & DT2 Members  https://bitcointalk.org/index.php?action=trust;full