Come on man. Use deduction.
Did this happen to Madara?
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This usually happens when deva path abilities are maxed out.
So if Madara maxed out, why didn't he show any sign of fatigue?
You not used deduction properly because you are leaving out important details. 1) We know that when some uses another persons eyes it's more of a drain the the original holder (ie Kakashi). 2) Those are not Nagato's original eyes. 3) Madara is using his original eyes.
Not saying you're incorrect but your reasoning is faulty.