I actually agree to some extent. A small rasengan that had the width of naruto's palm acquired a width greater than Naruto himself when using SM. He could throw FRS, sense extremely well, gain immense strength, tanking capabilities, and react at last second intervals. I wonder what he can do now. Most people look past the amount it helped base Naruto, and think that since he's op in BM he can't get stronger, but that is false.
1. Juubi sized TBB if he fully powers it if we take a comparison ratio of a base rasengan against a Chou Odama rasengan and multiply this ratio to the TBB, although I am not necessarily saying this is true, simply possible.
2. His strength in base increased substantially, no not only will Kurama's chakra arms be much stronger, he will be capable of extending his reach even further, although that really isn't needed. Current BM chakra arms were capable of manhandling 4 Bijuu's, with SM he toys with them as Vegeta toyed with Andriod 19.
3. Reacted to Third Raikage's attack at the very last second and countered. Could sense beyond the skill level of an extremely skilled sensor type ninja.
4. He fell into a bed of spikes and din't even get hurt, while a regular shinobi would have been fatally wounded. With his already absurd tanking capabilities; stopping a Juubi Laser in BM, he should be nearly invincible in regards to tanking attacks in BSM..