It's not Oli. His grabs are very hard to punishable, and I wouldn't really call his grab combos "chaingrabs."Didn't m2k say something about Olimar having an awesome chain grab? Perhaps he was just kidding, or the post was bogus, but if Olimar does have a chain grab, his tether grab could leave him very punishable. I think it is Olimar.
ZSS makes the most sense by looking at the few characters left. D3, falco and IC have all been mentioned.