Stayc barely has a hit. ASAP is no where near say dalla dalla Or next level. It's not huge but was enough to get them some popularity. They'll need a hit bigger than ASAP. Lightsum made zero noise. Gidle can't judge until they actually make a comeback.
StayC was like I don't know, let's say the 'So Cool' of Sistar? The breakout hit that isn't near the national hit level but a hit that got the public to notice them. It's up to their follow up music to see how things go.
Right now the interesting one to watch would be IVE.