This is why brawl is stupid. No one understands anything about it. (Nothing against you, just the game.)
You obviously don't understand anything about melee then.
You have no idea what you are talking about lain. In melee, you could roll from the jab get-up. The jab only forced you into your get-up animation if you were not holding a direction.
Another thing you are wrong about is why thunders combo is not in brawl. Thunders combo forces you into your get-up animation assuming you didn't roll after the waveshine to jab. During the get-up animation you had enough time to do several things. Grab/Shffled Uair/Charged Usmash ect.
The reason this doesn't work in brawl is because the jab completly skips the get-up animation, and just puts them into thier standing animation, meaning they can always react before you.
Before you go trying to act like you know what you are talking about, you should at least get your facts straight.
Otherwise you just look like an idiot.
Also, Nintendude is right, footstools are your best bet for the forced get-up.