Meh, it seems to me that we're going to see Luffy fighting Saturn.
I do agree that the Ancient Robot probably plays a role in this arc, and it could act to stall or aid in the Strawhats' escape.
Saturn won't necessarily fall this arc, but it would be weird if he doesn't fight Luffy.
But we'll see I guess.
It's also plausible that Saturn is the Linlin equivalent on WCI, and Borsalino is the Katakuri and the Strawhats just manage to escape but not win here.