the nice thing about mainland IC builds is you can go into deep water with your fleet or bounce it around africa/alaska as a distraction and still be sending units into asia or use it to supplement your IC mainland production. 1 IC in kwang and four trannies and you are sending 3 units/turn into china and 4/turn into both FIC and bury.
even with all that the FIC IC is still strategically better than kwang (imho) but it is also a much more tired and worn strat being a standard J1 for me since the earliest days of classic. new is always fun for our group and if i do pull japan next game (i have been chomping at the bit to do so for SEVERAL months now) i am going kwang IC J1 just to see what it presents.