Lox.
"Keith decides that it would be helpful to offer an explanation."

True.

"He provides ONE possible explanation."

No he did not.
He reported the explanation given by Straw and Cryer, that was later endorsed by Shafiq, Ahmed and Allibhai-Brown.

"He makes no attempt to draw our attention to any other explanations."

True.
For the same reason YOU did not Lox.
There isn't one!
If you have one now please share it.
DO YOU HAVE ONE LOX????????
Answer please Lox.

In any case, I do not care about any explanation.
I have not the knowledge to assess one.
Unlike Straw, Cryer, Shafiq, Ahmed and Allibhai-Brown who have more knowledge than all of us.