Basically, I'm saying that all 'N' witnesses should try and see what they would think the block should look like, even though only one is authorized to generate the block.
A block is considered irreversible once 21 witnesses approved it. That means one producer and 20 verifier. Currently all witnesses run in a trustless mode, so they will verify all other produced blocks. When a witness starts the first time, it will verify the whole chain.
The idea that votes are weighted by activity is nice in terms of someone suddenly trying to instantiate a bunch of accounts all at once to influence a vote, but then it certainly seems dangerous that high-reputation accounts have more influence than normal folk.
DPOS means delegated proof of stake, so it is determined by stake, not by aktivity. You can argue that a minority with a lot of funds has the most power, but they also have most to loose by faulting. If I own one million of all invested steem, my witness votes will be pretty influential. But if I make a wrong move, that will hurt my one million a lot.
Most of your questions seem like issues in the whitepaper, not in the Blockchain 😊
RE: Some weaknesses in either the DPOS algorithm or its explanation