I think the match up before the chain grab was estimated to be something like 60:40 Snake. But with the chain grab, it practically makes Zamus a snake counter, considering that I don't think it's hard to grab him. One missed tilt and he's likely to get grabbed, especially since none of his tilts or other melee moves have more range than her grab. It'd be perfect for when he's charging a Dsmash, and will grab him out of mortar-slide. At game starts, mad zoning could be done with the suit pieces: Forget about chucking them right out, throw them all up/down at different parts of the field, maybe chcuking some as they come back down. Not only would this prevent him from getting his zoning game going, but it would force a lot of shield/spot-dodge/roll, and likely put him in a good position to be grabbed for what could be a 60% lead right off the bat.
This is all theoretical, of course. But I think it's worth considering both as a tactic, and match up consideration. If she always had suit pieces, I'd give it 70:30 Zamus, at least. I just feel that those pieces absolutely **** his zoning/stage control game, and lead him right into the chain grab, if you play aggressively enough while doing it but still space well. But, because they usually only last one stock or so, I'd say that he loses just that first stock pretty good and fast. So rather than 60:40 snake like it "used to be" or 70:30 Zamus if she always had pieces,, I'd give it 60:40 in Zamuses favor, if she can space well enough.