Former Marine Alexander Blackman refused bail ahead of murder appeal

The Criminal Cases Review Commission has referred a case back for a hearing on three grounds, with plans to add three more. The Court of Appeal will split the hearings if needed, starting in late January or early February, focusing initially on diminished responsibility. Three psychiatrists agree that Mr. Blackman had an adjustment disorder when he fired the fatal shot. Although bail was denied, an expedited appeal is set, offering hope for the case initially deemed hopeless.

How many grounds were initially referred back for the hearing, and how many additional grounds are being sought?

What are the implications of the expedited appeal hearing mentioned in the text?