BAir is not the issue.
The ROB is camping under a ****ing platform and FTilting him all day. That's the issue. Try to work some more the dropthrough platforms approaches (Bite, Uair, Nair) and then put him in the air and abuse the hell of it
That's all I gotta say, nothing much to add. Ike plays like that also, Snakes, DDDs, Marths and MKs OBVIOUSLY.
Sting, don't you EVER rely on BAir, If it was me I'd Powershield all SH Bairs and than proceed to punish you with Fair/Nair/Bair(if you are on my back) OoS.