The downvote pool will provide flags equal to 25% of VP. Whales have almost all VP. Flags return rewards to the pool, and whales extract ~90% of rewards due to stake-weighting. Whales will increase their share of stake, and no one will be able to do a damn thing about it.
Hordes of users won't be able to counter those flags, and not even Stinc delegating every Satoshi of it's stake to minnows will make that possible.
The key is that extra 25% (or whatever that percentage they decide on) doesn't allow the whales to control >50% of the active voting stake.
If they do, then there's the risk of the DPOS version of 51% attack.