Ok so I just had this idea. Krav is really old right? So he must have had to learn modern ways of speaking but his first language is technically old common like how English has an old english. So what if when he gets really frustrated he just starts spewing old insults, like he calls the toaster a “blood-sucking curr” or whatever. Or worse he just starts mixing slang from all the past generations with no regard as Taako looks on in horror