Windstar: You just named a bunch of moves that are punishable by AA, BB, 6KK and CE (which is kinda implied because it's i12). I asked you to name things which she can punish with heavier things, of which you named... 3 things, 3 things which Cervantes shouldn't be throwing out on random or as pressure, anyway.
You throw out those thing as stepcatchers or punishers, not as random pokes or pressure. It's the equivalent of saying "Leixia is really unsafe because of 6KK". You don't 6KK out of nowhere and neither should you aB or iGDR out of nowhere. I dunno what 1AB is, though, because I don't keep track of inputs, I keep track of what the moves look like.
You're almost never going to catch Cervantes in a WR B BE, 3B or FC3B, ever. Cervantes can just rely on poking and safe moves against Leixia because in that regard, he's just like Leixia, only more damaging. It can be a campfest and Leixia just has to outread him 3 to 1 in order to win.
Synraii: Block punish into mix-up is not a guaranteed combo or guaranteed damage and shouldn't be counted for anything. Also, what great mix-ups Leixia has!
4K is shit because it's high, has shitty damage and combos for shit. Its only saving grace is that it combos into CE. CE wasn't mentioned because it requires meter and it's kinda implied since it's i12 and once of her chief punishers. 4K is also i15, which is slower than 6KK (i14), which hits mid and not High. I believe 6KK also has greater range. As a punisher (i.e. guaranteed punish), there's absolutely no situation where 4K is superior to 6KK or a CE unless you're aiming for a CE combo (but I'm not sure the scaling is even worth is. I don't have the game on me right now, but doesn't 4K scale the damage so much that you get either the same damage as a clean CE or even less damage than a clean CE?).
4K is useful for frame traps, not as an actual punish. Why would you ever punish with 4K literally anything else in Leixia's arsenal unless 4K into CE gives more damage than a clean CE? 4K launches and gives you oki-zeme, I'll give you that, so there's that, I guess, if you like to have your opponent on the ground.