2P+K causes sit down stun. You can follow up with 6K 1P+KPK or KPPPK or 6K P+GP 1P+KPK or 6K P 4K+G (KPPPK/ 6K~G 7K). All of that was done in training on Fast escape though.
On Fastest you can get 6P or the SSS PP follow up. That's about it I think.
Just a quick heads up for anyone that is still worried about it, Jacky has two flip kicks: one is the normal 7K and the other is 7K+G which is chargeable and his power launcher.
