what i getting is if naruto joins support of all biju he can extract and become a true so6p and 9 tails will absorb and become 10 tails as long as all other tails join as one body.
the problem is the 10 tails is a body. the 1-9 is energy so in way it only natural that it go to the 10 tails like in manga. 9 tails cant become 10 tails.
however naruto can become one with all the tails in one body and become a so6p if survived. but all tails will all be seperate so naruto be 1-9 tails one body. that being if it ever happens.