So, on this relatively new decentralized DT system, mr.relax can be kicked out of DT2 without having Buchi-88 to remove him from his trust list, you just need more DT members exclude him [~mr.relax].
Exactly. If Buchi-88, as a DT1 member, keeps trusting mr.relax, it needs 2 DT1 exclusions for mr.relax to be kicked out from his DT2 position.
Accounts are DT2 as long as one DT1 inclusion is active and are kicked out if they have 1 more DT1 exlcusion than DT1 inclusions.
As far as I know, maybe someone can confirm.

Not anymore because if I'm correct, 1 DT1 inclusion makes him DT2 - and he needs 2 DT1 exclusions to be kicked out again. But before I created the topic, he only had 1 exclusion.