I don't know what to think about this.
Incorporating a fruit into his already existing arsenal, with which he has not even gone all out, is hardly believeable. Especially because after Wano we might only be one arc away from Luffy becoming the Pirate King.
And if it's Marco's or King's fruit we would pretty much know all of their fruits' abilities already and Sanjji would not even have enough time to get to their level of mastery. No one wants to see a guy struggling with a Gomu no Pistol, when we have already seen freakin G4 and partial G2.
It does not add anything to the story or to Sanji's character...coming from a big OP and Sanji fan.
Couldn't it be that he just goes all out with the RS, while having a gadget that enables him to release stuff like Hell Memories and with that he just beats a commander to a pulp? Would sound much more reasonable.
And it might also include the "..:even Zorofans will like it" phrase, cause Sanji destroying a monster like Jack, while speedblitzing around looking like a comet, might be pretty cool and definitely sets him up as an extremely powerful combatant.