To the accused, just try appealing the tag from those that have tagged you. As you can see not many DT members are interested in this matter because issue like this bring about double standard in the community. Here's a similar situation (supposedly worst than yours) that the accused (in this scenario) was just left with a warning (Neutral feedback) and so far it has turned out to be the right decision to have been made; [need DT] using multiple account, trading merit, self-talking, trading trust. Get those that tagged you to come into the discussion and appeal your tagged.

Putting into consideration, Sancho18 has (357 merit, 250 airdrop, 99 earned 8 recieved from alt) I would suggest this case should be a forgiveable one. The accused has earned almost 100 merit meaning he's quite a decent poster to have earned that much so unless there are more alts supplying the account with merit he should just be left with a warning (Neutral tagged). The other account only recieved 1 merit in return.

PS: More investigate can be performed on the case and if this is the only offend then he should be given a second chance like others with far more worst offends has recieved considering they all have decent forum activity records and not some bounty/spam/shit posters