Allowing Excluded DT-1 Members votes to still be active is a hole in the system.
I disagree. I think this gives the kind of decentralization and depth to the trust system that we're trying to achieve. This avoids making it so a handful of DT1 users are able to control the entire DT.
Those users that are excluded from DT1, but meet all of the other criteria of the new system are certainly members that should have their votes be valid, in my opinion.
Which promotes gang-like retaliatory exclusions [1] (the first case is TheFuzzStone, who
only excluded TMAN and suchmoon
because they excluded him (for legitimate reasons)). As per the OP, retaliation is not welcome. Therefore, I'm unsure what's theymoses game theory reason for allowing this.
[1] You got nothing to lose (probably), and you get obsessed by negative emotions. If you don't get in, you won't feel permanently excluded to begin with.