Indeed. A confusing state for us all.
Maybe a legal expert can pop in an educate us further at some point.
Were the bookies really offering odds on the outcome of this? If so, I assume you used your knowledge to clean up.
It certainly seems odd, but I wouldn't say it leaves a bad taste, it's simply that neither the prosecution or defence thought it would help their case to call them as a witness.
I read your posts about the case you were on before, and you have experience on this subject that most of us don't. I don't understand the idea 'Would I have felt personally threatened by him?'. What if it was someone who was beating up people of a certain age, race, gender etc, and I didn't fit...
I don't know whether the verdict is right or not, but what I will say is that he has at least already had some punishment for his actions (like missing the Ashes), and will probably think twice before doing something like that again.