5K->2D and 5K->5D is actually a pretty good mixup, you can definitely get some damage off either end if you have tension
i use 5K generally as a way to AA in most cases and air-to-ground combo connecting
but yeah don't abuse too much cuz it will only work so much
you can use 2D in certain situations to dodge moves (IE ky's stun edge, Sacred Edge as well, on wakeup i hear vapor thrust misses you if you 2D)
if your not too close 2D->GF FRC is good
get GF FRC down though atleast to where you can do it most of the time or atleast be able to do it since its really important for pressure