IMO, to be added in Trust list of others, users should have either trustworthy or contributions over their time in the forum. There are some components that build up trustworthy and reputation of one user:
- Contributions: Good post history is a plus point; good threads is another plus point, and merit history with regularly received merits is another significant plus point.
- Trustworthy: Through tradings with others, through scam fightings (scam accusation threads or posts).
If you suggest using rank as one of restriction to be added into Trust list of DT1 members, it is unfair, and un-logically if the applied rank is Legendary. I think that if there is a higher restriction on rank for DT1 voting, it should be the Senior Member rank. Nowadays, with the merit system, users need to earn 250 merits to become Senior members, from which I do think that we can see how they contribute to the forum (or abuse to get those merits). It is enough.
If one user seriously works to become a Senior Member when began as new-era newbie, s/he does understand the value of that account and don't take risks by abusing Trust system.

If I was right, last two months, theymos even added Full Member rank to his Trust list, @DIKUL.

To sum up, I think the forum should restrict acceptable ranks to be voted in DT1 at Full Member and above ranks; or Senior member and above rank.