I had the honour to talk to both Hackett and an officer (who picked up a medal) in the Guards Armoured on separate occasions in the early 90's - both in very odd circumstances I have to say
They both described it as a gamble - probably worth taking originally but far too risky when the intelligence was in - but they were never sure who actually saw that intelligence in detail
At the end of the day everyone did their best but it was never going to work....
I was astonished how phlegmatic they were about it TBH - they just kept on repeating how lucky they'd been as individuals to come through when so many of their men and mates didn't