Quite an old thread but I'm pretty sure I was on the right track
Sanji shown some interest in Queen's laser technology and the mechanical and laser shooting arm Sanji ripped off was very close to the RS remains. If he told Franky were to find it, he might have recovered both the arm and whatever remained of the RS (the suit was able to withstand an attack from King, it is impossible it was completely destroyed by Sanji's stomping on its canister).
Franky already repaired his shogun in Wano but he didn't mention anything about Queen's arm or the RS. It is important to remember Sanji already wanted Franky and Usopp to modify the RS's design, something that never happened, but they have probably discussed about it during the fortnight before the raid to Onigashima. It wouldn't be absurd for Franky to work on a secret project for Sanji.
Now Franky is beside Sanji and everything seems lost. Kuma and the robot can't take on both Kizaru and Saturn, not even if Luffy fights alongside them. Not to mention Vegapunk is there, ready to say something about Judge and Sora, a matter he has been absurdly silent about. He hasn't even looked at Sanji twice.
You know what it means right?
New RS Sanji may appear anytime