I don't think that themarkymark/buildawhale and blocktrades/darthknight are the same person.

HIVE is more centralized than STEEM ...

I don't think it's more centralized than STEEM, but right, is is rather centralized (which I myself described here).

At least downvote his blog posts and comments while powering down.

It doesn't have any real positive/useful effect to leave even more 'scorched earth' behind while going ahead.

I feel more sad than angry, considering the potential of HIVE with its technology and interesting dapps on the one hand combined with greed, an astonishing lack of communication and interpersonal skills on the other hand, but already decided to move on.