Solvency Capital Requirement (SCR)

I understand that funds with no look-through are treated as type 2 equity when calculating their capital charges. It is unclear to me, when calculating the concentration risk, that if there is no additional capital charge for concentration risk for funds with no look-through because their investments cannot be identified. I understand that naturally funds with no look-through bear a high equity capital charge but isn't the excessive capital charge compensated by the potential concentration capital charge from funds with look-through?