@Shlowpoke: Thanks for the reply! I had always wondered why the tk236b when doing an oki mixup, now I know it serves no real purpose haha. Also, like LivingShadow said, 2b has a longer range which is useful since there are certain situations whereby your third rekka will launch your opponent, but a 2a will whiff. However, for now 2a 5c will serve my purposes sufficiently.
@fiendmaw: We are talking about F-ryougi...?
@Rokunaya: That's some useful information. 3f seems like a pretty small time frame, but damn it's causing my relaunch consistency to drop from 90+% using 2a to less than 50% using 2b
and yes 2b has imba hitboxes