To Naruto, team 7 is filled with wild animals.
He tries to think of himself as a frog, like Ero-sennin. (Because the old man is strong and Naruto needs to be strong.)
Sasuke is like a cat. (Arrogant, vain, black as midnight.)
Sakura is like a cat. (Disdainful, purring for affection she'll never get.)
Naruto never liked cats. (Or frogs for that matter.)
Two years later, and the animals have changed.
He is a fox. (He accepts that and embraces it, feeling wise, as foxes are wise.)
Sasuke is a wolf. (He's caught a scent and will follow it, but in the end he'll miss his pack mates.)
Sakura is a tiger. (A cat, once, but she has grown strong and fierce and kind.)
Naruto realizes he was never a frog and Sasuke was never a cat, so even before he left they all coexisted.
He is pleased to realize coexistence can happen again.