I could use some mid-level math to deduct the power of Naruto + Bee vs Juubito in its current state.
a) First of all, we know each tailed beast is a source of power. More tails, more power, this gives us a relation of order. Ergo:
Code:
1 tail < 2 tails < 3 tails < ... < 8 tails < 9 tails
b) We know that BM Naruto (half of Kurama's power) could deflect the beasts combined Bijuu dama made from the two to the seven tails, before the beasts gave chakra to Naruto, this means...
Code:
2 tails + 3 tails + 4 tails + 5 tails + 6 tails + 7 tails <= 9 tails / 2
This is...
4 tails + 6 tails + 8 tails + 10 tails + 12 tails + 14 tails <= 9 tails
This is not logic, this means that the "tails" variable is not linear nor quadratic!
c) The above sentence tells us an interesting hint... This mean that the function that involves the chakra inside a tailed beast can't be linear. It must be at least non-quadratic, so the formula that involves the power inside a beast is mostly a "powered" function... the formula could be more logical, as telling the following...
Code:
tails^2 + tails^3 + tails^4 + tails^5 + tails^6 + tails^7 <= tails^9 / 2
If we tinker a bit with the solving of "tails", we find that tails is aproximately "2" (yin and yang? someone?

)
d) The beasts gave Naruto a bit of their chakra in the form of "names". Minato has the other half of the Kyuubi. I bet that the added quantity of chakra the beasts gave to Naruto is almost the same quantity the Juubi got from the Hachibi and Kyuubi...
(2 to 7) Beast Given chakra = Ginkaku/Kinkaku Kyuubi + Hachibi Tentacle
Code:
tails^1 + (1 - Given chakra) ( tails^2 + tails^3 + ... + tails^7 ) + Ginkaku/Kinkaku Kyuubi + Hachibi Tentacle <= tails^8 + tails^9
That could be looked as
Code:
tails^1 + tails^2 + tails^3 + ... + tails^7 + Ginkaku/Kinkaku Kyuubi + Hachibi Tentacle <= tails^8 + tails^9 + Given Chakra
That as I said in the first paragraph of d), could be reduced to
Code:
tails^1 + tails^2 + tails^3 + ... + tails^7 <= tails^8 + tails^9
If we replace the variable "tails" with the deducted number "2", we get the following...
1 + 2 + 4 + 8 + ... + 128 <= 256 + 512
255 <= 256 + 512
e) Obviously, this deduction has a fatal flaw... Basically, I'm saying that Bee is stronger than Juubito... so I'll make an adjustment under a certain assumption... "The Naruto BM bijuu-dama deflected the six beasts bijuu-dama by luck because the beasts were fighting and they were slowing down, they were starting to become exhausted, so I'll re-adjust the numbers a bit... starting by the variable "tails", I'll put it as "1.85".
Code:
tails^2 + tails^3 + tails^4 + tails^5 + tails^6 + tails^7 <= tails^9 / 2
[COLOR=#000000][FONT=Times New Roman]157.39262196328[/FONT][/COLOR] <=> [COLOR=#000000][FONT=Times New Roman]126.91576151863[/FONT][/COLOR]
Now the Naruto's Bijuu Bomb could have win or failed, the numbers are not so far one of each other. His bomb worked because of luck, this is more realistic.
Now let's see the final result, replacing "tails" by "1.85":
Code:
tails^1 + tails^2 + tails^3 + ... + tails^7 <= tails^8 + tails^9
[COLOR=#000000][FONT=Times New Roman]159.24262196328[/FONT][/COLOR] <= [COLOR=#000000][FONT=Times New Roman]391.03775170605[/FONT][/COLOR]
Now, it makes sense. Basically, people, mathematically I can assure that if Naruto combines Kurama's Yin and Yang, and the Hachibi, using the beasts given chakra, he can overhelm the Incomplete Juubi power.