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In addition to the resources listed above, you can also find a rich list here:
http://richlist.btsgame.org/#/richlist/bts which can help answer your questions about centralization.
Most of the top 10 holders are centralized exchanges, bitcoinfan has recently sent all his BTS to Poloniex so he should be out of that list. The account alohacs currently has just under 20 million BTS as the biggest non-exchange holder. That means the biggest individual account that's not an exchange holds ~0.8% of total supply.
In terms of development Cryptonomex (CNX) has been the main driver and most of their proposals have been implemented, but they're currently focused on the new project STEEM.