I think you've got a bit muddled there: SGH bought the business after all the accounts were restated. After the millions spent on due diligence. After Mr Grech's arrogance to say he knew better and had his own magic formula. The WTG shareholders benefited from his acquisition.
QPP shareholders, not SGH, were damaged by KPMG's prior failures...you poor buggers were shafted by Gretchs incompetence.