Outside, Naruti hasn't shown anything that would allow him to dodge Bijudama
bijuudamas only move as quickly as FRS, clone spam is another counter, and he has super shunshin and super durability in SM. And bijuudama explosions are far weaker than getting hit directly with the attack, that's how taka and suigetsu, deva and orochimaru all survived the blast without much damage.
or use that many clones while all using Big Ball Rasengans.
In sage mode, his clone limit only applies if he has clones elsewhere gathering chakra, if he does not have them doing that he can make as many as he wants to. In the very pein fight he made countless clones while in SM and had them disguise as rocks.
His base clone empowered with a tiny bit of Kurama's chakra was able to use an army of clones weilding giant rasengans. Against Pain, he had the chakra to use at the very least 8 FRS, and in the kyuubi fight we saw that a FRS did far more damage than SM COR barrage. Also, if he was to fight the kyuubi outside of his mind, then it would not be sealed in him and thus he would be able to fuse with Ma and Pa for indefinite sage mode.
Why don't you show Narutos feats on the outside that puts him even close to where he was inside his head?
okay, he tossed Kurama to the ground, replicated by his physical strength feat of tossing pein's - rhino boss summon into the sky.
- We already know he can use FRS.
What else?
- 25+ SM COR can be done if he is fused with ma and pa for indefinite sage mode considering his clone's war arc feats and the fact that naruto way back in the fuuton arc has the reserves to have 200 clones each using wind rasengans for hours and hours.
- dodging chakra tails is something granted with his enhanced physical power and sage sensing
Even DemonicAvenger calls BS on that fight and he's the guy that made a thread on how Naruto is stronger than Edo Madara.
now hold on, calling BS on that fight would mean plot induced stupidity rather than characters having more power than they have in the outside world. In addition to that, it could just be that the guy is a Kurama fan rather than a Naruto fan which would be why he opts ot make BM Naruto stronger than MAdara while Sage Naruto far weaker than Kurama.