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The DOJ and FBI have been withholding documents to cover up their malfeasance
The FBI and DOJ know what they have but they do not know all of what the IG has or has not yet discovered
If the IG releases their documents first, then the DOJ and FBI will know what the IG has uncovered and if the IG does to have it , the DOJ and FBI can continue to hide any undiscovered documents not already in the IG’s possession
If Nunes and Goodlatte force the DOJ and FBI to release their records before the IG, then the DOJ and FBI will be forced to release anything they have because if they don't produce it and the IG has it , it's obstruction of justice time for the people responsible.
The FBI and DOJ will also be at risk of charges of coverup and obstruction if they over redact the released documents to conceal or obstruct (like they have been doing in the past) and the IG releases clean, unreacted versions of those documents.
This is about to get very interesting