Re: "Did such a thing happen?" In fact it didn't, at least not the time we saw it.
Look at the panel on the left directly under the flashback. Naruto's head is tilted up looking at the flashback panel and questioning if such a thing happened. This is Kishimoto trolling. The eyes are incorrect. When he mixes Kurama's chakra with Sage chakra a cross occurs manifested in the eyes, yet clearly in the middle left panel he has both chakra types but no cross is occurring.
Originally Posted by BEASTLY NARUTO
Who is arguing? Did such a thing happen? Yes, because Kishimoto just drew it, but did it happen at the time? No, it did not, and it still doesn't explain why he is merging the chakra but his eyes aren't changing.
Originally Posted by thegame
Kishimoto plays games like this all the time. How many requests has he probably gotten for a topless Tsunade? Voila, Tsunade is topless.
Last week it was BCM with standard whiskers.