Think of it this way...
At 1G the A6M5 has an empty weight of about 1,700kg and the F6F5 an empty weight of 4,200kg.
At 7G the weight difference is amplified to 11,900kg vs 29,400kg.
A strong airframe can do a lot, but the F6F5 has 17.5 more tonnes to carry in a 7G turn than the zero.
That's a lot of extra weight for the wings to support.
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