You can't absorb all the natural energy since it's infinite
You can't absorb all the natural energy since it's infinite
You can't absorb all the natural energy since it's infinite
You need to use some of your own chakra to balance it with Natural energy, thus producing senjutsu chakra. Naruto was very low on chakra and hence couldn't enter Sage mode.
He easily could have, but he wasted his chakra on a failed rasengan and a couple shadow clones. If he went sage mode instead. Or made 1 clone to enter sm, then he would've dominated Sasuke with frog kumite.
El-Batsuke...
Probably, but wouldn't the earth have shrivelled up and died if he absorbed all of the Nature chakra? :|