First we have an uncontained failure, and then we don't.
To any technician observing, I should think this determination could be made in less than a minute - I'd expect 5 - 10 seconds even - and that determination would remain unchallenged through the final report. The evidence will be so blatant, there will be no reason to doubt.
But now we have the NTSB waffling on the question. What is going on here???