By now CfB has nothing to do anymore with IOTA other than his company using the Tangle - or intending to do so, but he will probably fork it. David Sønstebø and CfB have been bff for a long time until the moment they had different opinions about the future of IOTA. You can read what David has to say about that here.
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To my knowledge, this is the Bitcointalk account David is in control of: iotatoken