Are you for real? Lmao
Oda references things, doesn't copy them. He's writing a story, not reenacting references.
What now, should Luffy play supporting role while Momo fights Kaido?
Should Oda abandon Marco's desire and character to not fight Kaido and promote new generation for the sake of a reference?
Should Momo offer Kibi Dango to Luffy, Marco, etc for their services? But wait! Tama did that. So is Tama momo-taro?
Should Kaido live like the Oni did at the end?
Wano and Onigashima are full of references from Momotaro, in fact the alliance in itself represents it so: Dog (minks), Boy (samurais), Monkey (Strawhats), and Pheasant (Marco), etc. Hell, Tama was literal copy of Momotaro for a while- even had a monkey and dog following her for kibi dango, just like Momotaro. It's actually hilarious that you're only just realizing the Momotaro reference...
But none of that means he should make the fight exactly like Momotaro. These are references, dude, not exact stories. Momotaro's story is all over the place, divided into parts and distributed- but none of it is reenactment.
If you want to believe Zoro won't fight Kaido, good for you, but don't give "Well in reference these animals fought so Oda is going to abandon character, plot and story to make these animal representatives fight as well!" as your reason, that's beyond crazy.
Oda is not a shit children's writer, please...