If you are stating the old USAF HI-LO with a top fighter and the second tier, it could well work that way, although for the record the FC-31 has garnered no official interest from the PLA, and is presently an export fighter. Maybe you and I should go together and buy one for a flying club??? LOL
However, back on topic to the J-20, things in Asia are very fluid these days, much like a professional chess competition, there is a lot of moving and shaking going on at present, this will no doubt push the J-20 project to the fore-front, looks like J-31/FC-31 are still in the backseat.
India's aggressive pursuit of PAK-FA will make the J-20 an imperative! The J-20 and the PLAN carrier project have swapped priorities back and forth several times between #1 and #2, with the balance of projects following??? no doubt the J-15 is very parallel to the PLAN carrier, but for the moment it seems that the J-20 is Golden?? we will see what the year of the goat brings upon further reflection, but J-20 is in a sweet spot developmentally and I would anticipate that LRIP will progress rapidly from here unless something "kooky" happens?