SinoSoldier
Colonel
J-16 draw less interest because it still use the flanker airframe, unless they can reduce the RCS of the basic flanker airframe design to good LO, J-16 will still have the problem of avoiding radar detection. Though I would expect J-16 to have better performance than SU-30MKK/MK2 since it is expected to be equiped with latest avionics and strike management suite.
In strike role, using stealth or any means (eg, stand-off range) to avoid detection before launch of missiles/bombs is of paramount importance to completion of strike mission and survival of the aircraft.
I don't think you get what the J-16 is for. The J-16 is what comes after the J-20, providing the bulk of the air support much like how USAF F-15E would come in after the mission by F-117.