Ah, I didn't see that post until today.
Good, I love some good discussions. ^_^
Well, what I meant with Kirby>Jiggz ground game was that due to Jiggz having a basically nonexistent ground game, she needs to rely on SH'd aerials while another char is on the ground. This is where we can beat her, as TwilightKirby overviewed. Utilt can beat an incoming Dair easily, as we have more range on basically every move. Shieldgrabbing is another problem for Jiggz, but I can't really point that out as that's a problem with every character and doing SH'd aerials.
In the air, I can admit that I was wrong to say Jiggs has a better game than Kirby. Well-spaced Bairs by Kirby beat Jiggly's Fair, which is her best approach move as it has decent priority and the best range of all aerials. Our Dair beats her Uair for sure, so we can even approach from the top. Also, the stone isn't as hard to hit as you make it out to be. Either for edgeguarding or a Jiggs trying to Rest/aerial from below, we can hit her and the knockback combined with her extreme light weight sends her flying.
You can't say our specials don't amount to nothing. As outlined above, hammer outranges everything (maybe her Fair is equal) and kills at low % on the ground and in the air. Final Cutter allows us to space even more without spamming, and rack up some damage at good times. Inhale can be used to get Jiggz ability which allows for a fairly easy KO or to inhale then stage spike, and with Kirby's gimping ability with Dair she will have a tough time getting back up to the edge.
Jiggs>Kirby is nonsensical to me. Everything Jigglypuff has, Kirby does it better. We have more range on aerials, tilts, and smashes. Jigg won't be on the ground at all, but Utilt can shut down her SH'd aerials, and the others can be shieldgrabbed. We can actually gimp Jigglypuff with stage spikes, hammers, and occasional Dairs, but Jiggly can't do the same unless the Kirby player doesn't know how to air dodge/hammer. Kirby has the complete advantage in this match-up.
EDIT: Also, that video is ----. The Kirby player doesn't know how to use Kirby well at all. I saw like...3 Bairs, he stayed on the ground most the time, and used Final Cutter way too much.