Lmao. B obviously does not win. Getting Naruto's power means nothing here because Naruto before the power ups is 2-3 tiers above the likes of Killer B. His Bijuu Mode becomes larger, more durable, and the power of his Bijuu Dama becomes only half what Naruto and Sasuke did at VoTE with their first BD-Chidori clash. That's not enough to even seriously damage Kakashi's Susanoo.
-In Bijuu Mode he becomes a large target for Kamui, and Kamui Shuriken especially.
-Standard BD is tanked with some damage.
-Renzoku Bijuu Dama is tanked with some more damage than standard, but nothing serious. Or the balls are warped by Kamui Shuriken.
-Perfect Susanoo still makes short work of the Hachibi. If a normal PS can shit stomp Hachibi (which it can) then a Rikudo PS would shit stomp Rikudo Hachibi. He will be nowhere near Naruto's power so he will never tank Kakashi's attacks.
Once Bijuu Mode is finished, Kakashi obliterates him with Susanoo.
Half of hagoromos chakra? with that Bee rises up to level where kakashis cheap ass rikudo chakra means nothing, neaning he will be much stronger overall
Terrible terrible logic. Strength is comprised out of all abilities, not just chakra. Obito's chakra>>DMS Kakashi's since DMS Kakashi is only using a piece of a Juubi Jin's chakra, yet DMS Kakashi is around Obito's level and would beat him handily in combat. B having half of Hagoromo's power matters naught because even with it, a Perfect Susanoo used by someone with only a portion of JJ Madara's Rikudo Chakra is enough to beat him, with nothing more than moderate difficulty to say the least.
And no, it doesn't go either way, B gets wrecked.