Still think all this ROV activity is just buying time while the relief wells are drilled.

The public just would not sit still if BP came out and said the only solution is to plug it deep below using the secondary bore. Ever try to plug up you garden hose with your finger in the end? But you can stop the flow by pinching the hose.

Curious that they are drilling two relief wells. They may have so much pressure that one bore will used to install a temp plug to reduce flow and pressure while the second one can pump cement for a secure kill.