You just failed to understand me. In some case you're right but in other case you're wrongIn the end of the day both of them got power ups from an external chakra source, why are we arguing over this ? Sasuke solos, Naruto solos, you can't pick and choose.
Naruto wasn't begging Kurama for power it's why Kurama gave him the ability to use BM in the first place. As Anatsuken said, if God blesses you with power and you use that power yourself you still solo, same logic applies to Jinchuuriki.
Example: in vote 2 battle Naruto was clearly not soloing Sasuke but teamed up with Kurama to defeats Sasuke.