Jiggs Uair gimps easily. So does samus dair, pits arrows, zelda dtilt distant hitbox plus dair, Mario footstool, wario dair plus double jump and upb, fox shine, Kirby/D3 inhale, and wario bite. All of these can abused. Did I forget to mention edgehogging? I am more inclined to say deal within then recognize that it is a huge problem. Does sonic dair work too well with bair? Maybe but it's no harder to setup with any of these than to do that. Let's add luigi fireballs and pikachu thunder jolt and most of all, double thunder bolt. And these attacks need no setup other than hitting you offstage in any number of ways. IC blocks also kill any character that has an upb with startup.