Think of the momentum of the rasenshurikens. There's no way the enton could burn the attack in an instant. It has to be absorbed by the wind element before it could burn it up, which in that time the chakra orb (massive rasengan) or tbb would still be going straight for Sasuke, with Sasuke's enton coated all over it.
Didn't you read? Sasuke didn't absorb all of the chakra, that's why Naruto could still punch him and make a rasengan afterwards to counter Sasuke's attack.
What about the momentum of the arrow? Enton wouldn't burn the attack, the Rasenshurikens would instead make the flames bigger and stronger, absorbing the power granted by Fuuton and you'd have bigger arrows racing towards Naruto.
Indeed fire consumes wind. But the FRS isn't stationary, if it gets engulfed by the flames it will keep moving to sasuke's destination.
Like I said, what about the chakra orbs inside the rasenshuriken? When they did the combo attack, the wind element absorbed the enton arrow in an instant. The attacks were aimed at the same direction at the time, but the fact still remain that the wind element absorbed the arrow as soon as it made contact. That still leaves the chakra orbs inside the attack which was shot towards Sasuke.
But the Enton arrow isn't stationary. The flames engulf the wind and keep on moving towards Naruto's destination.
Then the wind enhances the arrows, which loses some power piercing through the orbs, and continue onto Naruto in a weakened form, but still stronger than when fired due to being enhanced by wind. The orbs won't have enough force to push back the arrows due to the fact that the attacks consist of wind and the orb, so the orb is only a fraction of the entire attack's power.
Throughout the manga it has been shown that enton lacks stopping power. Enton lacks the cutting power of wind or even lightning.
The Enton arrow wouldn't be stationary as well, it would be moving counter to the RS therefore. It could push the RS back slightly, clashing with it, enveloping it, then growing stronger
