brawlin isn't taking into account jump startup.
6 frame jump + like 1 frame float (i think) + nair/bair 2/6 = 7/13
it's fast, but slower than ya think so it's something to keep in mind.
and at high percent u want a grab anyway so u can refresh your moves n ****.
Yea, I see what ur saying. It is still pretty useful tho. U can hit a Snake with a ground float nair or bair if he ftilts ur shield. That's just 1 example. And like Peachguard said, it works pretty well when ur opponent is near the edge. U can also do this even if ur opponent is at a lower percent and can follow up with a dash attack, dsmash, etc. But, I can see where the grab can be better at times.