His biggest problem is that he's mentally scarred from the KO losses and is afraid to let his hands go.....He can't give his best effort in such circumstances, therefore it's time to say NO MORE !!
A for effort is what you give Marquez and Vazquez, or JMM against Pacquiao. Plenty of lesser fighters who deserve an A for effort too...but certainly not Jones in this fight...far, far from it.
I do, he tried his best to win throughout, but couldn't. When he wasn't throwing punches he was trying to find out ways and not be too hesitant, but couldnt.