The difference between Shikikoyo and Blade Bash is down to the player. From my own experiences with having merited Blade Bash are if I happen to have excess TP then I will most likely have Sekkanoki available also which would render Shikikoyo useless: IE at the start of fights were it is not possible for other DD's to gain TP without them using Opo Necklace (which is another option of course).
But having a very strong form of Stun every 5 minutes has and still does to this day save my/other peoples butts so I made the choice to have the option to save lives instead of giving them TP.
If I had my way DD's should either be SAM/ or /SAM anyway (yes yes I know of /NIN situations to enter here<?>) and I'm not meriting Shikikoyo just to give MNK or THF TP either, no no.