Nigel,
I've read most of the 1900+ posts.
Shoot me down any time, but the way I read it all, it is as simple as this.
One TR locked out... rather unusual, but they have flown with that before.
Now, short, slippery runway.... oh sh!t.
What's the SOP about one TR inop? We won't get the same decel with one TR!
Oh, don't pull that engine into reverse, then.
.....
And somehow, instead of doing what should be ingrained: slamming both TLs to reverse, never mind if one TR is inop, they don't touch the #2 TL.
The rest is a sad history.