In post-2010 PLAAF, J-10A/B will be used as air superiority fighter, whereas J-11B/Su-30MKs will be multirole fighters mainly for ground attack, now you tell me J-10 is a low-end companion for Su-30MKs? Give me a break!
J-10>>>>>Su-30MKI, and JF-17>=Su-30MKI, regarding air superiority.