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Just to address this part, I don't think that Juubito's chakra arms necessarily scale above the earlier Biju Bomb that failed to break through the barrier.Chakra arms > FCRF > Juubidamas
When Juubito breaks the barrier, Killer B questions if Juubito is stronger than when it was just the Juubi and Eight-Tails provides the explanation that before it was just throwing power around whereas now it is focusing it.
This makes sense as the single Biju Bomb that detonated inside the barrier earlier essentially had less than a quarter of its power directed at each of the four walls of the Four Crimson Ray Formation (since part of the omnidirectional explosion will be aimed upwards and downwards and not contribute to the majority of the force which is going outward to the four walls). Whereas each of Juubito's four chakra arms are focused specifically on a tiny part of the barrier; drawing it inwards and forcing it to collapse. It's like the difference between a bullet and a shockwave; an explosive shockwave may have more energy overall but its spread over a much wider area compared to the bullet which is focused on a surface area the size of the tip of the bullet.
So just because Juubito was able to collapse the barrier with his chakra arms doesn't mean the raw power of the chakra arms surpasses the earlier Biju Bomb explosion; so we shouldn't treat Minato slapping away one of these arms as being comparable to the entire AP of the Biju Bomb explosion.