Yea, there was what seems to be an o-ring/seal that was broken on the BOP but my issue is saying the wellhead got a pressure kick that would have destroyed the BOP, regardless of the seal I assume.
Think of this, 45,000 PSI.... across that 21" diameter pipe.... on the bottom of the BOP. It blew RIGHT threw it and into the riser pipe.
Seal or not, I don't think that BOP had the structure to handle that kind of kick. Specifically with the mud and other items being the agent blowing through the system.
It was like a MASSIVE water jet, cutting right through it.