naruto uses the biju to be powerful hence getting the help of others. so your saying "sasuke could absorb more chakra to get the edge in the fight" yea thats really proving that their equal . . . .
No people saying naruto can outlast him. If I remember correctly the powers naruto gets from the other bijuus + kyuubi isn't much and can be absorbed so he can keep on fighting.
And plus he has a bunch of hax rinnegan techniques that we probably haven't even seen since the rinnegan can do anything basically. It's the most haxxed piece of shiit In the manga and it gets heavily nerfed everytime,