Kurama confirmed in the manga he could merge with Ma and Pa while also maintaining kyuubi chakra mode.
While this may seem like "Oh Naruto just has constant flow of Senjutsu Chakra" people forget Naruto is also capable of giving benefits.
Basically what this means is.
If Naruto/Ma/Pa merge together.
Ma / Pa / Naruto will all be using BM/ Senjutsu enhanced attacks simultaneously not just Senjutsu attacks.
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While this may seem like "Oh Naruto just has constant flow of Senjutsu Chakra" people forget Naruto is also capable of giving benefits.
You must be registered for see images
Basically what this means is.
If Naruto/Ma/Pa merge together.
Ma / Pa / Naruto will all be using BM/ Senjutsu enhanced attacks simultaneously not just Senjutsu attacks.