Additionally, just focusing on E1 and B1 ignores possible losses in M3. For example, I believe binaryfate (correct if wrong) is out like almost 100 BTC worth of XMR that he deposited but was not credited for.
I'm not aware of this, but if Risto created unbacked M3 tokens then he owes that too.
I do not support redirecting Risto's assets 'for the good of the game/development' (what legitimate basis is there for that?) when there are players who got screwed by him personally having created and sold unbacked tokens who have a more clear and obvious claim against those assets.
Also, as I said before about abandoned accounts, if his assets remain frozen pending settlement of the debts (or in theory forever) that will drive up the value of the M that does float. Both the game/town and other players will benefit.
They will drive up the value equivalently to everyone who owns M, not to those with debts to be repaid.
His assets should be put on auction at a time in the future to settle his debts if it were possible.