@Portgas-D-Ace:
I've got a really dumb one. Crocodile will show up and create a sandstorm and the sand (or dust) will stick to Trebol's sticky body rendering it useless and making it easier for Robin to pwn Trebol. There will be a touching scene in which Crocodile will reconcile with her, à la Luffy/Bellamy. Sniff
Ya know, the first part isn't really dumb. Okay Croco-boy showing up can be considered so since this thing is already overloaded with charas. and the last touchy/feel-ly part is since it would be OCC for both Croc and Robin. (though I'de love a scene of the smiling…err grinning... at each other and Croc says "I knew you'd find a way to survive. Joined Strawhat, hmmm? Well done."
But the part of sand or dust negating Trebol's sticky body is actually plausible.
After all if wetness (water/blood ect) can counter Crocodile's flowing sand, then makes sense that something like fine solid particles like sand, dust, ...heck even dirt.. can be used to counter a sticky substance. .