My Dad, who was PO of several different largish congregations at varying times, sat on a number of JC's during his lifetime.
He maintained that alleged wrongdoers confessed to being unable to pray to Jehovah between committing the actual sin and appearing before a JC.
He told me that this was invariably the case and that confessing wrongdoers felt a great sense of relief after appearing before a JC because they were able to pray once more.
Totally unable to pray..psychological, perhaps?
Englishman.