It is very likely that if the top kill had been designed to deliver more than 109 bpm of 16.4 ppg drilling fluid below the BOP stack for a sustained period, the Macondo blowout could have been stopped between May 26-28, 2010. Given that the well was successfully shut-in with the capping stack in July, and that the subsequent bullhead (static) kill was successful, certainly a higher rate top kill would have been successful at that time.

His role gradually deepened as he assembled a team of scientists from the Department of Energy laboratories, universities and other government agencies. By late May, his confidence had grown and he was giving orders to BP officials, including his demand to stop the top kill effort even though some BP engineers believed it could still succeed.