As far as i see, Rine sausage is just usefull to counter Kakuzu Online with his Chaos proc. As Kakuzu deals only nin dmg. In any other fight, rine sausage seems like *. Would not invest in him at all. Just wait Madara. 6p Naruto is just upgraded version of Kurama link, so if you have that or closing in on SR from GNW then no point of getting him. But i would say sausage, unless you like him that much no point of getting him. Only sausage thats playable is skill experiment Susano. As he has better dmg, more immunity and scaling.

Huh? Maan Kuram link vs 6 paths?
As i see them( have both) is:
Mistery: Team dmg and combo over 20 easly VS 9 targets at random(rng bruh) intur, and hits like avrage 12combo
Standart: Can accually cause chase but only 1 target 10combo VS 10combo cant chase, 4 targets.
Passive1: Dodge vs Dodge
Passive2: Chase imobilize VS Imobilize, but removes buffs
Passive3: Immunity to him and +1 target VS Immunity + leech

All in all, that upgrade is not worth 20k coupons. As the mistery will be dodged, immunity will be surpressed, on both of them. Thing is Standart is better on Kurama, but Chase is better on 6paths. Misteries are close call, i like Kurama better in 1v1, but GNW ofc 6 paths is better.
Because why you use Naruto in first place? To combo over 20. To proc Tobirama,Kisame,etc. As for dmg, both of them even stacked deals close to no dmg that would be compared to accual dps ninjas.

Once the Bond comes for Kurama, 6 paths gona be useless. As Kurama will intur 9 targets and deal 30% more dmg. (Bond with Edo minato)