Yeah, I didn't think it had any startup, to be honest. Thanks for reconfirming that.
63214B is decent with your back against the wall. It jumps over crouchers, and the knife always ricochets off the wall for an optional IAD knife catch if you need it for pressure. However, it telegraphs pretty badly so if someone suspects one, they can knock it out of the air pretty easily. Overall, still a cruddy move.
623A goes under people. I guess it's made to be the other way out if people jump in on you.
I played around and changed my gameplan to see how much of a difference it would make, and the results were pretty good. Knife throw > air catch > knife throw really helped pin down the other guy alot easier; I think I got something like four knife throws in a row or something until they finally started doing something about it.
Then I started sticking 2369B_C into the mix: it has such a huge hitbox that if they didn't block it in the air, they'd get wallslammed immediately and I could continue throwing knives from far away with impunity. 214A helped as well as it had more horizontal range. The neatest thing I did all night was a blocked 2369A, land, 5BB (while they're stuck in the air) > 214A into wall combo.
So now I'm using her from midscreen to fullscreen now to harass them from a distance, and it works pretty well. A lot better then trying to rush in and land bnbs, anyway. I'm going to try sticking 214C and 22C in a bit more, to see if that helps her tighten the distance and see if that gets any results. There might be some use for 6AAA as well, too.