Lauda had (2) net-inclusions on DT1.
Lauda now has 6 net-inclusions on DT2.
Lauda got blacklisted from DT1.
I have 2 scenarios
1: suppose Lauda wasn't blacklisted, but got 3 more exclusions from other DT1 members. That would mean Lauda was removed from DefaultTrust entirely.
2: the current state (Lauda blacklisted from DT1). Now suppose Lauda gets the same 3 exclusions from DT1. That would mean Lauda still has 3 net-inclusions on DT2 and remains on DefaultTrust.
Am I correct here? If so, it is possible that a DT1-exclusion leads to a member being on DT2 which wouldn't happen without blacklisting. This is probably caused by the fact that excluded DT1-members can vote against other DT1-members, but they can't vote against DT2-members.
Is that the intended behaviour of the DefaultTrust system?
No. if Lauda is excluded from DT1, he cannot be on DT2. I think your assumptions as to whose votes count might be flawed.
If you are on DT1, your trust list flows down regardless if your ratings show up or not.