I'm going to ignore comments about Ta being big and scary because Ta are usually 9-11ft, which is big, yeah, but then you remember there's been tanks that run through the station and Warforms, which are almost twice as large as a Ta (15-17ft). Sure, Ta are big and scary and shit, but the Aurora is a research station, seeing big aliens should be a norm, and Breeders fit the role perfectly given that they are born more socially-knowledgeable than any other caste.
Making the Vaurca Consular a random Ka with one or two Za guards would do nothing because each Ka from a Hive is already, in a way, representing their Hive. Ka and such are too busy working, which is what they are tasked with normally. A Ta is respected more among all vaurcae (you will rarely see a vaurca insult a breeder from another hive on hivenet, everyone knows it'd be a dumb move, unlike insulting a normal Ka), and like I said earlier, they are basically born social, given that they must birth and command their own batch of vaurcae too.
With that said, I will use the rest of this post to reply to JK's comment.
Vaurcae are not OP or really that strong, infact, I'd say they are the weakest species. I will repeat this until I die. When you are unwhitelisted and hear what vaurcae have, you think it is insane and that they should be nerfed. Once you actually play vaurcae, they are the worst species for combat. If they don't have blinders, you can easily blind them, they can't self-regenerate damage, and the only thing that stops their bleeding is k'ois or some form of bandage, whether it be ghetto or normal. They also take twice as much toxins, both Workers and Warriors take 50% and 20% extra burn damage respectively, and there's also the fact people are less willing to save a vaurca in general.
Their Hivenet can help for them to help eachother, but...AIs and Borgs can read Hivenet messages, so you can't really plot much with any AI that's actually reading chat because they can report super suspicious shit to Security or Command. And while vaurcae can relay shit to others, that doesn't mean much because you can easily plot around that. Don't say any sensitive shit about your plans to the bug, and just be smart about not telling them much of anything. Plan around these traits, Vaurcae are the only real race that have this anyways.
And yes, I know that IPCs also don't self-regenerate, are EVA-proof (in some circumstances without a cooler, but all circumstances with one), and can be memed with flashes, but they can't bleed at all, nanopaste is super-tricord to them, and they can't fucking feel pain or need to care about sympathy.
But why WOULD you fucking try to fight an 8ft tall bug in Security with mandibles capable of biting your head off? If you find it concerning, stay out of melee range if they're bigger than you because that'd be tactically worse icly if you didn't.
Ta are locked behind two whitelists, one of which is a whitelist for an alien species played by few people. Most vaurcae you see on manifest are from the same few people who just like the species or characters or just people whom have had the whitelist for a long time, unlike every other species except dionaea, vaurcae doesn't get waves or floods of apps. So this really won't be a problem, we won't ever need 3 fucking whitelists for one type of job, an alt-title, no less.